Improved equipment for bending test of asphalt concrete girder

Abstract

The utility model discloses asphalt concrete girder bending test improved equipment which comprises a base, a limiting piece, a pressure applying device and two supporting seats, and one side, facing the other supporting seat, of each supporting seat is provided with a supporting part and mounting holes located above the supporting part at intervals. The limiting piece is detachably mounted in the mounting hole and has a limiting state of extending between the two supporting seats, and in the limiting state, a limiting space for placing the end part of the asphalt concrete test piece is formed between the limiting piece and the supporting part. The pressure applying device is arranged on the base and located in the middle area between the two supporting seats, the pressure applying device is provided with an ejection piece extending upwards, and the ejection piece is used for abutting against the bottom of the asphalt concrete test piece fixed between the two supporting seats. According to the technical scheme, the asphalt concrete test piece can be conveniently disassembled and assembled.

Description

Technical Field

[0001] The utility model relates to the field of civil engineering, in particular to an improved device for asphalt concrete beam bending test. Background Art

[0002] Asphalt concrete core wall earth-rock dams are widely used in the range of medium and high dams, but the bending performance of asphalt concrete core walls is currently mainly verified by small beam bending test. The small beam bending test is carried out indoors using an asphalt concrete small beam bending tester according to the test specification "DLT 5362-2006 Test Procedure for Hydraulic Asphalt Concrete". Due to the limitations of indoor test conditions, the volume of the small beam bending specimens used in the test is generally 200mm×35mm×40mm, while the maximum particle size of the coarse aggregate of the asphalt concrete core wall is 19mm, and the uneven distribution of the specimen aggregate will inevitably affect the results of the asphalt concrete small beam bending test, resulting in the inability to accurately obtain the flexibility of asphalt concrete, which affects the design standards and quality inspection judgment of the asphalt concrete core wall.

[0003] In this regard, a device capable of performing a bending test on a beam is proposed, where the two ends of the specimen are fixed to two support seats respectively, and a pressure device is provided under the specimen, and the pressure device is used to abut the specimen upward to bend and deform. In this device, a fixed plate with an upper and lower spacing is currently provided on the support seat, and the end of the specimen is inserted between the two fixed plates from the side of the support seat. However, this method is relatively troublesome both in installation and removal.

[0004] The above content is only used to assist in understanding the technical solution of the utility model and does not constitute an admission that the above content is prior art. Utility Model Content

[0005] The main purpose of the utility model is to provide an improved device for asphalt concrete beam bending test, aiming at facilitating the disassembly and assembly of asphalt concrete test pieces.

[0006] In order to achieve the above-mentioned purpose, the utility model proposes an improved device for asphalt concrete beam bending test, comprising:

[0007] Base;

[0008] Two support seats are installed on the base at intervals, and each support seat is provided with a support portion and installation holes spaced above the support portion on one side facing the other support seat;

[0009] a limiting member, which is detachably mounted on the mounting hole and has a limiting state extending between the two support seats, in which a limiting space is formed between the limiting member and the support portion for placing the end of the asphalt concrete specimen; and

[0010] A pressure device is arranged on the base and located in the middle area between the two support seats. The pressure device has an ejector extending upward, and the ejector is used to abut the bottom of the asphalt concrete specimen fixed between the two support seats.

[0011] Optionally, each of the support seats is provided with at least two of the mounting holes, and the mounting holes are spaced apart along the width direction of the base, and each of the mounting holes corresponds to one of the limiting members.

[0012] Optionally, the supporting part includes a connecting plate and a supporting plate that are connected and perpendicular to each other, the connecting plate is attached to the surface of the supporting seat facing the other supporting seat and is welded to the supporting seat, the connecting plate is located below the supporting plate, and the upper surface of the supporting plate is used to support the asphalt concrete specimen.

[0013] Optionally, at least one of the support seats includes a fixed seat, an adjustment seat and a limit assembly, the fixed seat is fixed to the base, the adjustment seat is slidably installed on the base along the arrangement direction of the two support seats, and is located on the side of the fixed seat facing the other support seat, the support portion is provided on the side of the adjustment seat facing the other support seat, the mounting hole includes a first hole section provided on the fixed seat and a second hole section provided on the adjustment seat, the limit assembly is installed on at least one of the fixed seat and the base, and cooperates with the adjustment seat to limit the upward movement of the adjustment seat.

[0014] Optionally, the limiting assembly includes at least two limiting rods, each of the two opposite sides of the fixing seat is provided with a first limiting portion, and the two opposite sides of the adjusting seat are provided with a second limiting portion, at least one of the limiting rods is connected to the first limiting portion on one side of the two fixing seats, and at least one of the limiting rods is connected to the first limiting portion on the other side of the two fixing seats, and the second limiting portion of the adjusting seat is connected to the limiting rod on the corresponding side.

[0015] Optionally, the limiting assembly further includes a plurality of locking members, and each of the first limiting portions and the limiting rod is connected via the locking members.

[0016] Optionally, the second limiting portion is in the shape of a rod extending outward from the adjustment seat, and the limiting rod abuts against an upper side of the second limiting portion; or, the second limiting portion is in the shape of a ring, and the limiting rod is inserted into the second limiting portion.

[0017] Optionally, the base is provided with at least two slide rails, and the adjustment seat is provided with slide grooves matching with the slide rails.

[0018] Optionally, the support seat further includes a plurality of support screws, and each of the fixing seats is provided with at least two support screws in the up and down directions, and the support screws abut against a side of the adjustment seat away from the placement position.

[0019] Optionally, the improved asphalt concrete beam bending test equipment also includes a displacement detection device, which is arranged on the base. The displacement detection device has a detection probe, and the detection probe is used to be arranged at the position where the ejection piece abuts on the asphalt concrete specimen to detect the deformation of the asphalt concrete specimen.

[0020] Optionally, the pressure-applying device further includes a top plate, which is disposed at the upper end of the ejection member, and is in the shape of a long strip extending along the width direction of the base, and is used to abut against the bottom of the asphalt concrete specimen.

[0021] Optionally, the top plate has a measuring end, and when the top plate is abutted against the bottom of the asphalt concrete specimen, the measuring end is located outside the asphalt concrete specimen, and the detection probe is located above the top plate and abuts against the upper surface of the top plate.

[0022] Optionally, the displacement detection device is detachably mounted on the base.

[0023] Optionally, the base is provided with a mounting structure, and the pressure-applying device is detachably mounted on the mounting structure.

[0024] Optionally, the pressure-applying device has a pressure gauge, and the pressure gauge is used to display the force applied by the ejector to the asphalt concrete specimen.

[0025] Optionally, the distance between the two support seats is not less than 1.5 meters and not more than 2.5 meters.

[0026] The technical solution of the utility model is that each support seat is provided with a support part and a mounting hole spaced above the support part on one side facing the other support seat, and a limiter is provided which is detachably mounted on the mounting hole, so that the limiter has a limit state extending between the two support seats, and a limit space is formed between the limiter and the support portion in the limit state. When installing the asphalt concrete specimen, the limiter is in an avoidance state retracted into the mounting hole, so that the upper part of the limit space is in an open state, and the asphalt concrete specimen can be directly placed on the support parts of the two support seats from top to bottom. Then the limiter is extended out of the mounting hole to the limit state, so that the asphalt concrete specimen can be limited to move up and down together with the support part. After the test is over, the limiter is first retracted into the mounting hole, so that the upper part of the limit space is in an open state, so as to prevent the limiter from interfering with the asphalt concrete specimen, so that the asphalt concrete specimen can be disassembled, so that the disassembly and assembly of the asphalt concrete specimen is relatively simple and convenient, which is conducive to improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram of an embodiment of an improved device for asphalt concrete beam bending test of the utility model;

[0029] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0030] Figure 3 for Figure 1 The enlarged view of point B in the middle;

[0031] Figure 4 for Figure 1 Structural schematic diagram of asphalt concrete specimens installed on the improved equipment for medium asphalt concrete beam bending test.

[0032] Description of Figure Numbers:

[0033] 10. Base; 11. Slide rail; 12. Mounting structure; 20. Support seat; 201. Mounting hole; 202. First hole section; 203. Second hole section; 21. Fixed seat; 211. First limiting part; 22. Adjusting seat; 221. Limiting space; 222. Second limiting part; 223. Mounting plate; 224. Reinforcing rib; 225. Support part; 24. Support member; 25. Reinforcing plate; 30. Pressure device; 31. Ejector; 32. Pressure gauge; 33. Top plate; 331. Measuring end; 40. Displacement detection device; 41. Mounting frame; 42. Dial indicator; 421. Detection probe; 50. Limiting member; 60. Asphalt concrete specimen.

[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions, taking "A and / or B as an example", including solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0038] The utility model provides improved equipment for asphalt concrete beam bending test.

[0039] In the embodiment of the present utility model, Figures 1 to 4 As shown, the improved device for the bending test of asphalt concrete beams includes a base 10, a stopper 50, a pressure device 30 and two support seats 20. Each support seat 20 is provided with a support portion 225 and a mounting hole 201 spaced above the support portion 225 on one side of the support seat 20 facing the other support seat 20. The stopper 50 is detachably mounted on the mounting hole 201 and has a stopper state extending between the two support seats 20. In the stopper state, a stopper space 221 is formed between the stopper 50 and the support portion 225 for placing the end of the asphalt concrete specimen 60. The pressure device 30 is provided on the base 10 and is located in the middle area between the two support seats 20. The pressure device 30 has an ejector 31 extending upward, and the ejector 31 is used to abut against the bottom of the asphalt concrete specimen 60 fixed between the two support seats 20.

[0040] Specifically, the mounting hole 201 penetrates the support seat 20 so that the limiting member 50 can be installed in the mounting hole 201 from the side of the support seat 20 away from the other support seat 20. The base 10 is roughly in the shape of a long strip, and the two support seats 20 are spaced apart in the length direction of the base 10. During assembly, the two ends of the asphalt concrete specimen 60 are first placed above the support portions 225 of the two support seats 20 from top to bottom, and then the limiting member 50 is installed from the mounting hole 201 and extends above the end of the asphalt concrete specimen 60, so that the end of the asphalt concrete specimen 60 can be fixed in the limiting space 221 formed between the support portion 225 and the limiting member 50. After the installation is completed, the asphalt concrete specimen 60 is spaced apart from the base 10, and the upper end of the ejector 31 of the pressure device 30 abuts against the middle position between the two ends of the asphalt concrete specimen 60. Therefore, when the ejector 31 of the pressure device 30 moves upward, it can abut against the asphalt concrete specimen 60 to bend and deform upward. After the test, the limiting member 50 can be retracted into the mounting hole 201 or removed from the mounting hole 201 to prevent the limiting member 50 from interfering with the asphalt concrete specimen 60 , so as to facilitate the disassembly of the asphalt concrete specimen 60 .

[0041] The deformation degree of the asphalt concrete specimen 60 can be determined by setting a displacement detection device 40 or by manual measurement using a ruler, so that the asphalt concrete specimen 60 can be subjected to a destructive bending test and a bending residual performance test.

[0042] The technical solution of the utility model is that each support seat 20 is provided with a support portion 225 and a mounting hole 201 spaced above the support portion 225 on one side of the support seat 20 facing the other support seat 20, and a limiter 50 is provided which is detachably mounted on the mounting hole 201, so that the limiter 50 has a limit state extending between the two support seats 20, and a limit space 221 is formed between the limiter 50 and the support portion 225 in the limit state. When installing the asphalt concrete specimen 60, the limiter 50 is in an avoidance state retracted into the mounting hole 201, so that the upper part of the limit space 221 is in an open state, and the asphalt concrete specimen 60 can be directly placed on the support portions 225 of the two support seats 20 from top to bottom. Then, the limiter 50 is extended out of the mounting hole 201 to the limit state, so that it can limit the up and down movement of the asphalt concrete specimen 60 together with the support portion 225. After the test is completed, the limit member 50 is first retracted into the mounting hole 201, so that the upper part of the limit space 221 is in an open state to prevent the limit member 50 from interfering with the asphalt concrete specimen 60, so that the asphalt concrete specimen 60 can be disassembled. This makes the disassembly and assembly of the asphalt concrete specimen 60 simpler and more convenient, which is conducive to improving the test efficiency.

[0043] In some embodiments, each support seat 20 is provided with at least two mounting holes 201, and each mounting hole 201 is spaced apart along the width direction of the base 10, and each mounting hole 201 is correspondingly installed with a stopper 50. In this way, the force on a single stopper 50 can be reduced, and the risk of deformation and fracture of the stopper 50 can be reduced, so that the test process is stable and reliable.

[0044] In some embodiments, the support portion 225 includes a connecting plate and a supporting plate that are connected and perpendicular to each other, the connecting plate is attached to the surface of the support seat 20 facing the other support seat 20 and is welded to the support seat 20, the connecting plate is located below the supporting plate, and the upper surface of the supporting plate is used to support the asphalt concrete specimen 60. Such an arrangement can increase the connection stability between the support portion 225 and the support seat 20 and reduce the risk of fracture of the support portion 225. Of course, in other embodiments, the support portion 225 can also be integrally formed on the support seat 20.

[0045] In some embodiments, the improved device for the asphalt concrete beam bending test further includes a displacement detection device 40, which is disposed on the base 10. The displacement detection device 40 has a detection probe 421, which is used to be disposed at a position on the asphalt concrete specimen 60 where the ejector 31 abuts, so as to detect the deformation of the asphalt concrete specimen 60. When the detection probe 421 of the displacement detection device 40 is installed at the matching position between the asphalt concrete specimen 60 and the ejector 31, it can specifically abut on the asphalt concrete specimen 60 or on the ejector 31. With such a configuration, the deformation detection accuracy of the asphalt concrete specimen 60 can be improved, thereby improving the accuracy of the asphalt concrete flexibility performance test.

[0046] Optionally, the spacing between the two support seats 20 is not less than 1.2 meters, that is, in this way, asphalt concrete specimens 60 with a length of more than 1.2 meters can be tested, which can greatly reduce the impact of factors such as the size of the asphalt concrete material and the material distribution on the test results, making the state of the asphalt concrete specimen 60 closer to the state of the asphalt concrete core wall, greatly improving the accuracy of the asphalt concrete flexibility performance test, and can better provide experimental and theoretical basis for the selection and optimization of the oil-stone ratio in the asphalt concrete core wall mix design stage, thereby ensuring the construction quality of the asphalt concrete core wall.

[0047] In some embodiments, the spacing between the two support seats 20 is not less than 2 meters and not more than 6 meters. Specifically, if the size of the asphalt concrete specimen 60 is too large, it will increase the difficulty of the test, which is inconvenient for the test. It will also cause the asphalt concrete specimen 60 to be deformed due to the large size, which will increase the error of the test result data. When the asphalt concrete specimen 60 with a length of 2 meters to 6 meters is used for testing, it can not only facilitate the test operation, but also make the asphalt concrete flexibility test more accurate. Optionally, the spacing between the two support seats 20 is not less than 2 meters and not more than 4 meters, so that the accuracy and convenience of the asphalt concrete flexibility test can be better taken into account. Among them, the spacing between the two support seats 20 can be 1.8 meters, 1.9 meters, 2 meters, 2.1 meters, 2.2 meters, 2.5 meters, 3 meters, 4 meters, 5 meters, and 6 meters.

[0048] Optionally, the distance between the mounting hole 201 and the support portion 225 is not less than 250 mm and not more than 930 mm, and can be 250 mm, 370 mm, 500 mm, 700 mm or 930 mm, that is, the height of the limiting space 221 can be set between 250 mm and 930 mm.

[0049] In some embodiments, the pressure-applying device 30 has a pressure gauge 32, which is used to display the force of the ejector 31 on the asphalt concrete specimen 60. Optionally, the pressure-applying device 30 is a jack with a pressure gauge 32, so that the force of the ejector 31 on the asphalt concrete specimen 60 can be accurately measured, thereby improving the accuracy of the test data.

[0050] In some embodiments, at least one support seat 20 includes a fixed seat 21, an adjustment seat 22 and a limit assembly, the fixed seat 21 is fixed to the base 10, the adjustment seat 22 is slidably installed on the base 10 along the arrangement direction of the two support seats 20, and is located on the side of the fixed seat 21 facing the other support seat 20, and the side of the adjustment seat 22 facing the other support seat 20 is provided with a support portion 225, the installation hole 201 includes a first hole section 202 provided on the fixed seat 21 and a second hole section 203 provided on the adjustment seat 22, and the limit assembly is installed on at least one of the fixed seat 21 and the base 10, and cooperates with the adjustment seat 22 to limit the upward movement of the adjustment seat 22. Specifically, during installation, the limit member 50 extends from the first hole section 202 into the second hole section 203, that is, the limit member 50 is simultaneously located in the first hole section 202 and the second hole section 203. The position of the fixed seat 21 on the base 10 is not adjustable, and one or two adjustment seats 22 are slidably installed between the two fixed seats 21, and the arrangement direction of the two support seats 20 is that one of the support seats 20 points to the direction of the other support seat 20. After the asphalt concrete specimen 60 is installed between the two adjustment seats 22, it is installed on the fixed seat 21 (base 10) and the adjustment seat 22 through the limit assembly, so that the adjustment seat 22 is fixed to the base 10 to prevent the adjustment seat 22 from moving upward during the test. By sliding the adjustment seat 22 between the two fixed seats 21, the position between the two limit spaces 221 can be adjusted, so that asphalt concrete specimens 60 of different lengths can be adapted for testing, thereby improving practicality. Of course, in other embodiments, the relative position between the two support seats 20 can also be fixed.

[0051] Optionally, each support seat 20 includes a fixed seat 21, an adjustable seat 22 and a limit assembly. In some embodiments, the minimum distance between two adjustable seats 22 is not less than 1.5 meters, and the maximum distance is not more than 2.5 meters.

[0052] In some embodiments, the limiting assembly includes at least two limiting rods, the two opposite sides of each fixed seat 21 are provided with a first limiting portion 211, the two opposite sides of the adjustment seat 22 are provided with a second limiting portion 222, at least one limiting rod is connected to the first limiting portion 211 on one side of the two fixed seats 21, at least one limiting rod is connected to the first limiting portion 211 on the other side of the two fixed seats 21, and the second limiting portion 222 of the adjustment seat 22 is connected to the limiting rod on the corresponding side. Specifically, taking two limiting rods as an example, one of the limiting rods is provided on one side of the two support seats 20, one end of which is connected to the first limiting portion 211 of one of the fixed seats 21, and the other end is connected to the first limiting portion 211 of the other fixed seat 21, and the second lower portion of the adjustment seat 22 located on this side is connected to the limiting rod. Another limiting rod is arranged on the other side of the two supporting seats 20, one end of which is connected to the first limiting portion 211 of one of the fixing seats 21, and the other end is connected to the first limiting portion 211 of the other fixing seat 21, and the second lower portion of the adjusting seat 22 located on this side is connected to the limiting rod. Such arrangement has a simple structure, and no matter where the adjusting seat 22 is between the two fixing seats 21, it can be easily fixed with the limiting rod, and the installation is convenient. Of course, in other embodiments, the limiting assembly includes a plurality of screws, and the adjusting seat 22 is fixed to the base 10 by screws.

[0053] In some embodiments, the limiting assembly further includes a plurality of locking members, and each first limiting portion 211 is connected to the limiting rod via a locking member. Specifically, the locking member may be a threaded fastener such as a screw or a bolt, or may be a clamp or the like. In this way, by connecting the first limiting portion 211 and the limiting rod via a locking member, the matching accuracy between the first limiting portion 211 and the limiting rod can be reduced, which is beneficial to reducing costs and is also convenient for installation. Of course, in other embodiments, a receiving hole may be provided in the first limiting portion 211 of one of the fixing seats 21, and a screw hole may be provided in the first limiting portion 211 of the other fixing seat 21, and one end of the limiting rod may be inserted into the receiving hole, and the other end may be screwed into the screw hole.

[0054] In some embodiments, the second limiting portion 222 is in the shape of a rod extending outward from the adjustment seat 22, and the limiting rod abuts against the upper side of the second limiting portion 222. That is, during installation, the limiting rod can be abutted against the upper side of the second limiting portion 222, thereby limiting the upward movement of the adjustment seat 22, which is simple in structure and easy to install.

[0055] In other embodiments, the second limiting portion 222 is annular, and the limiting rod is disposed in the second limiting portion 222. This arrangement can effectively prevent the limiting rod from being separated from the second limiting portion 222, and the test process is more reliable. Of course, in other embodiments, the limiting rod can also be fixed to the second limiting portion 222 by a clamp or a wire.

[0056] In some embodiments, the base 10 is provided with at least two slide rails 11, and the adjustment seat 22 is provided with a slide groove matched with the slide rails 11. In this way, a guide can be provided for the sliding of the adjustment seat 22, and the adjustment seat 22 can be prevented from deflecting.

[0057] In some embodiments, the support seat 20 also includes a plurality of support members 24, and at least one support member 24 is abutted between the fixed seat 21 and the adjustment seat 22 of each support seat 20, that is, each adjustment seat 22 is abutted and limited by at least one support member 24 with the corresponding fixed seat 21 to limit the displacement of the adjustment seat 22 toward the fixed seat 21 during the test, thereby improving the reliability of the asphalt concrete beam bending test improvement equipment.

[0058] In some embodiments, the support member 24 is a support screw, that is, the support seat 20 includes a plurality of support screws, each fixed seat 21 is provided with at least two support screws in the up and down directions, and the support screws abut against the side of the adjustment seat 22 away from the limiting space 221. With such a configuration, when conducting experiments on asphalt concrete specimens 60 of different lengths, the adjustment member can be limited only by adjusting the screws, which has a simple structure and is easy to use.

[0059] In some embodiments, the support seat 20 further includes a reinforcing plate 25, and each fixing seat 21 is provided with a reinforcing plate 25 on a side facing away from another supporting seat 20, and the reinforcing plate 25 is also connected to the base 10. Such a configuration can improve the connection strength between the fixing seat 21 and the base 10, reduce the risk of deformation and tipping of the fixing seat 21 during the test, and improve the reliability of the asphalt concrete beam bending test improvement equipment.

[0060] In some embodiments, the adjustment seat 22 includes a mounting plate 223 and a plurality of reinforcing ribs 224. A support portion 225 is provided on one side of the mounting plate 223, and a plurality of crisscross reinforcing ribs 224 are provided on the other side. In this way, the weight of the adjustment seat 22 can be reduced while ensuring that the structural strength of the adjustment seat 22 meets the use requirements, and the manufacturing is also convenient.

[0061] In some embodiments, the pressure device 30 further includes a top plate 33, which is disposed at the upper end of the ejector 31, and is in the shape of a long strip extending along the width direction of the base 10, and is used to abut against the bottom of the asphalt concrete specimen 60. Specifically, the length of the bottom plate is not less than the width of the asphalt concrete specimen 60. By arranging the top plate 33 between the ejector 31 and the asphalt concrete specimen 60, during the test, the asphalt concrete specimen 60 can be subjected to a relatively uniform force in the width direction thereof, thereby avoiding the asphalt concrete specimen 60 from being subjected to a concentrated force locally, and improving the test effect.

[0062] In some embodiments, the top plate 33 has a measuring end 331. When the top plate 33 is abutted against the bottom of the asphalt concrete specimen 60, the measuring end 331 is located outside the asphalt concrete specimen 60, and the detection probe 421 is located above the top plate 33 and abuts against the upper surface of the top plate 33. Specifically, when the ejector 31 moves upward to deform the asphalt concrete specimen 60, the top plate 33 can move upward together. Therefore, by abutting the detection probe 421 against the top plate 33, the deformation of the asphalt concrete specimen 60 can be measured. Compared with the situation where the detection probe 421 is directly abutted against the asphalt concrete specimen 60, this can avoid the situation where the asphalt concrete specimen 60 is internally compressed when it is subjected to force, resulting in displacement deviation, which is conducive to improving the detection accuracy and the test effect.

[0063] In some embodiments, the base 10 is provided with a mounting structure 12, and the pressure device 30 is detachably mounted on the mounting structure 12. Such a configuration can facilitate the disassembly and assembly of the pressure device 30. For example, the pressure device 30 of different specifications can be replaced according to experimental needs, thereby improving the practicality of the asphalt concrete beam bending test improvement equipment. Optionally, the mounting structure 12 has a mounting groove, and the pressure device 30 is installed in the mounting groove. Optionally, the mounting structure 12 also includes a locking screw, which fixes the pressure device 30 to the base 10.

[0064] In some embodiments, the displacement detection device 40 is detachably mounted on the base 10; such a configuration can facilitate the disassembly and assembly of the displacement detection device 40. For example, displacement detection devices 40 of different specifications can be replaced according to experimental needs, thereby improving the practicality of the improved equipment for the asphalt concrete beam bending test.

[0065] Optionally, the displacement detection device 40 includes a mounting frame 41 and a dial gauge 42 mounted on the mounting frame 41, the mounting frame 41 is mounted on the base 10, and the dial gauge 42 has a detection probe 421. Optionally, the pressure device 30 includes a jack, and the jack has an ejector 31.

[0066] In some embodiments, the improved asphalt concrete beam bending test equipment also includes a thermometer, which is arranged on the base 10 or the support base 20 and is used to measure the ambient temperature so that the test personnel can determine the test environment conditions.

[0067] After installing the improved asphalt concrete beam bending test equipment on the leveled test site, it is necessary to adjust the improved asphalt concrete beam bending test equipment so that the pressure device 30 and the displacement detection device 40 are in the appropriate position, and then the asphalt concrete specimen 60 can be hoisted from the storage position to the improved asphalt concrete beam bending test equipment by the loader and fixed. At this time, the ejector 31 of the pressure device 30 abuts or is about to abut the bottom of the asphalt concrete specimen 60, and the detection probe 421 is set at the position on the asphalt concrete specimen 60 where the ejector 31 abuts. According to the test plan, the ejector 31 of the pressure device 30 is made to abut against the bottom of the asphalt concrete specimen 60 upward, so that the asphalt concrete specimen 60 bends upward. At this time, the displacement of the deformed part of the asphalt concrete specimen 60 compared with the initial upward movement can be detected by the detection probe 421. When the displacement of the deformed part of the asphalt concrete specimen 60 reaches the preset displacement change in the test plan, the ejector 31 of the pressure device 30 is suspended from moving upward, wherein the suspension duration is the first preset duration in the test plan. After the test starts, the pressure value of the pressure gauge 32 is recorded every second preset duration until the test ends, and the test data of the bending test of the asphalt concrete specimen 60 can be obtained. Among them, the preset displacement change, the first preset duration, and the second preset duration are all data determined according to the test plan.

[0068] For the destructive bending test, the test is stopped when the reading of the pressure gauge 32 drops by 20% from the peak value. After removing the displacement detection device 40 and the pressure device 30, the asphalt concrete specimen 60 is dismantled, and the test equipment and the site are cleaned. Specifically, in the destructive bending test, as the pressure device 30 applies pressure, before the asphalt concrete specimen 60 is structurally damaged, the pressure of the pressure device 30 on the asphalt concrete specimen 60 gradually increases, that is, the reading of the pressure gauge 32 gradually increases, and the asphalt concrete specimen 60 reaches the peak value just before the structural damage occurs. When the asphalt concrete specimen 60 is structurally damaged, the reading of the pressure gauge 32 decreases. When the reading of the pressure gauge 32 drops by 20% from the peak value, the structure of the asphalt concrete specimen 60 is severely damaged and the test purpose cannot be achieved, and the test can be stopped. At this time, the asphalt concrete specimen 60 is not completely broken, so the displacement detection device 40 and the pressure device 30 can be removed first to avoid damaging the displacement detection device 40 and the pressure device 30 during the disassembly of the asphalt concrete specimen 60.

[0069] For the bending residual performance test, the test is stopped when the displacement detection device 40 detects that the deformation of the asphalt concrete specimen 60 reaches the preset displacement amount. After removing the displacement detection device 40 and the pressure device 30, the asphalt concrete specimen 60 is disassembled within a preset time, and the asphalt concrete specimen 60 is cut, and then the cut asphalt concrete specimen 60 is transported to the laboratory. Specifically, in the bending residual performance test, the preset displacement amount can be designed according to the actual test plan.

[0070] Under the condition that the disassembly and assembly requirements are met, the preset time is as short as possible, so as to complete the cutting of the asphalt concrete specimen 60 in a shorter time, reduce the risk of twisting of the asphalt concrete specimen 60, and help improve the test accuracy. In the process of disassembling the asphalt concrete specimen 60, the disassembly should be carried out smoothly and gently, and the specimen should be prevented from additional twisting and bumping during the whole process, so as to ensure the state of the specimen as much as possible. In the process of transporting to the rear laboratory, the specimen should be well protected to prevent the asphalt concrete specimen 60 from twisting, bending and deformation during transportation.

[0071] In the bending residual performance test, a buffer material is placed beside the asphalt concrete beam bending test improved equipment. After the test is stopped, the asphalt concrete beam bending test improved equipment is dumped onto the buffer material using a loader, and then the asphalt concrete specimen 60 is removed from the asphalt concrete beam bending test improved equipment. Specifically, sufficient buffer materials can be prepared before the experiment. After the test is stopped after reaching the predetermined bending deformation, the buffer materials are laid beside the experimental equipment. Then, the asphalt concrete beam bending test improved equipment can be hooked by a loader and a sling, and the asphalt concrete beam bending test improved equipment can be slowly pulled down, so that the entire asphalt concrete beam bending test improved equipment is placed on the buffer material. This can avoid affecting the asphalt concrete specimen 60 during the disassembly process and improve the test accuracy.

[0072] Before the 60° bending test of asphalt concrete specimens, you can first have a general understanding of the temperature during the test period based on weather forecast information, and prepare temperature control devices (such as ice cubes, braziers, hot air blowers, cold air blowers). If there is a sudden change in temperature, the temperature in the test area can be controlled in time to prevent excessive temperature changes during the test and affect the test results.

[0073] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An improved device for asphalt concrete beam bending test, characterized in that: include: Base; Two support seats are installed on the base at intervals, and each support seat is provided with a support portion and installation holes spaced above the support portion on one side facing the other support seat; a limiting member, which is detachably mounted on the mounting hole and has a limiting state extending between the two support seats, in which a limiting space is formed between the limiting member and the support portion for placing the end of the asphalt concrete specimen; and A pressure device is arranged on the base and located in the middle area between the two support seats. The pressure device has an ejector extending upward, and the ejector is used to abut the bottom of the asphalt concrete specimen fixed between the two support seats.

2. The improved asphalt concrete beam bending test equipment as claimed in claim 1, characterized in that: Each of the support seats is provided with at least two mounting holes, and the mounting holes are spaced apart along the width direction of the base, and each of the mounting holes is correspondingly installed with a limiting member.

3. The improved asphalt concrete beam bending test equipment as claimed in claim 1, characterized in that: The supporting part includes a connecting plate and a supporting plate that are connected and perpendicular to each other. The connecting plate is attached to the surface of the supporting seat facing the other supporting seat and is welded to the supporting seat. The connecting plate is located below the supporting plate, and the upper surface of the supporting plate is used to support the asphalt concrete specimen.

4. The improved asphalt concrete beam bending test equipment according to any one of claims 1 to 3, characterized in that: At least one of the support seats includes a fixed seat, an adjustment seat and a limit assembly, the fixed seat is fixed to the base, the adjustment seat is slidably installed on the base along the arrangement direction of the two support seats, and is located on the side of the fixed seat facing the other support seat, the support portion is provided on the side of the adjustment seat facing the other support seat, the mounting hole includes a first hole section provided on the fixed seat and a second hole section provided on the adjustment seat, the limit assembly is installed on at least one of the fixed seat and the base, and cooperates with the adjustment seat to limit the upward movement of the adjustment seat.

5. The improved asphalt concrete beam bending test equipment as claimed in claim 4, characterized in that: The limiting assembly includes at least two limiting rods, each of the two opposite sides of the fixing seat is provided with a first limiting portion, and the two opposite sides of the adjusting seat are provided with a second limiting portion, at least one of the limiting rods is connected to the first limiting portion on one side of the two fixing seats, and at least one of the limiting rods is connected to the first limiting portion on the other side of the two fixing seats, and the second limiting portion of the adjusting seat is connected to the limiting rod on the corresponding side.

6. The improved asphalt concrete beam bending test equipment as claimed in claim 5, characterized in that: The limiting assembly further includes a plurality of locking members, and each of the first limiting portions is connected to the limiting rod via the locking member; The second limiting portion is in the shape of a rod extending outward from the adjustment seat, and the limiting rod abuts against an upper side of the second limiting portion; or, the second limiting portion is in the shape of a ring, and the limiting rod is inserted into the second limiting portion.

7. The improved asphalt concrete beam bending test equipment as claimed in claim 4, characterized in that: The base is provided with at least two slide rails, and the adjustment seat is provided with a slide groove cooperating with the slide rails; and / or the support seat also includes a plurality of support screws, each of the fixed seats is provided with at least two support screws in the up and down directions, and the support screws abut against the side of the adjustment seat away from the placement position.

8. The improved asphalt concrete beam bending test equipment as claimed in claim 1, characterized in that: The improved asphalt concrete beam bending test equipment also includes a displacement detection device, which is arranged on the base. The displacement detection device has a detection probe, which is used to be arranged at the position where the ejector abuts on the asphalt concrete specimen to detect the deformation of the asphalt concrete specimen.

9. The improved asphalt concrete beam bending test equipment as claimed in claim 8, characterized in that: The pressure-applying device further comprises a top plate, which is arranged at the upper end of the ejector, and is in the shape of a long strip extending along the width direction of the base, and is used to abut against the bottom of the asphalt concrete specimen; The top plate has a measuring end, and when the top plate is abutted against the bottom of the asphalt concrete specimen, the measuring end is located outside the asphalt concrete specimen, and the detection probe is located above the top plate and abuts against the upper surface of the top plate; The displacement detection device is detachably mounted on the base.

10. The improved asphalt concrete beam bending test equipment as claimed in claim 1, characterized in that: The base is provided with a mounting structure, and the pressure-applying device is detachably mounted on the mounting structure; The pressure-applying device has a pressure gauge, and the pressure gauge is used to display the force of the ejector on the asphalt concrete specimen; The distance between the two support seats is not less than 1.5 meters and not more than 2.5 meters.

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