Track forming device, track test piece and track test equipment

Abstract

The invention belongs to the technical field of road tests, and particularly relates to a rut forming device, a rut test piece and rut test equipment, the rut forming device comprises a base, the base comprises a base body, a pair of lifting platforms and a mold, the pair of lifting platforms and the mold are arranged on the base body, and the pair of lifting platforms are arranged in a spaced mode in the second direction; the mold is located between the pair of lifting platforms and can move in the first direction, and an asphalt mixture is contained in the mold; the supporting frame is arranged on the base main body and comprises a supporting platform; the rolling wheel is positioned below the supporting platform and is in contact with the rolling surface of the asphalt mixture; the counterweight piece is connected with the rolling wheel and is used for applying a variable load to the rolling wheel; after the mold moves by a preset distance in the first direction, the rolling wheel reciprocates in the mold in the second direction, so that the asphalt mixture is rolled and formed into a rut test piece. According to the invention, the rolling working condition of the asphalt mixture on the construction site can be truly simulated, and the high-temperature rut resistance of the asphalt pavement can be reflected more accurately.

Description

Technical Field

[0001] The present application relates to the technical field of road testing, and more specifically, to a rut forming device, a rut specimen, and a rut testing device. Background Art

[0002] The rut specimen wheel rolling forming machine forms rut specimens in a way of overall rolling, that is, the arc-shaped rolling wheel similar to that of a steel drum roller is used to cover the asphalt mixture as a whole. However, the rolling method of the rut specimen is different from the actual rolling condition of "from light to heavy, overlapping half a wheel" at the construction site, and it cannot truly simulate the rolling condition during the actual construction process, and cannot accurately reflect the high-temperature rutting resistance of the asphalt pavement. Summary of the Invention

[0003] The purpose of the present application is to provide a rut forming device, a rut specimen, and a rut testing device, which can truly simulate the rolling condition of the asphalt mixture at the construction site, more accurately reflect the high-temperature rutting resistance of the asphalt pavement, and increase the evaluation credibility of the high-temperature rutting resistance of the asphalt mixture.

[0004] In a first aspect, an embodiment of the present application provides a rut forming device, including: a base, including a base body, a pair of lifting platforms provided on the base body, and a mold. The pair of lifting platforms are spaced apart along a second direction. The mold is located between the pair of lifting platforms and can move along a first direction. The mold contains asphalt mixture. The height of the lifting platform in a third direction is adjustable. The first direction, the second direction, and the third direction intersect; a support frame, provided on the base body, and the support frame includes a support platform suspended; a rolling wheel, located below the support platform and in contact with the rolling surface of the asphalt mixture; the rolling wheel can move relative to the support platform along the second direction and lift along the third direction; and a counterweight, provided on the support platform and connected to the rolling wheel, and the counterweight is used to apply a variable load to the rolling wheel; wherein, after the mold moves a preset distance along the first direction, the rolling wheel reciprocates in the mold along the second direction, and the rolling wheel can descend as the rolling surface of the asphalt mixture descends, so as to roll the asphalt mixture into a rut specimen, and the preset distance is less than the width of the rolling wheel.

[0005] According to the rut forming device provided by the embodiments of the present application, a variable load, for example, from light to heavy, is applied to the rolling wheel through a counterweight member to keep the rolling wheel in contact with the rolling surface of the asphalt mixture. After the mold is moved a preset distance in the first direction, the rolling wheel is driven to reciprocate in the second direction within the mold to roll and form the asphalt mixture within the mold into a rut specimen. Since the load applied to the rolling wheel by the counterweight member is variable and the preset distance that the mold moves in the first direction is less than the width of the rolling wheel, it can truly simulate the working condition of a roller on the construction site of "from light to heavy, overlapping half a wheel", more accurately reflect the high-temperature rutting resistance of the asphalt pavement, and increase the evaluation credibility of the high-temperature rutting resistance of the asphalt mixture.

[0006] In addition, the rut forming device according to the present application may further have the following additional technical features:

[0007] In some embodiments of the present application, the mold includes a test mold and a baffle plate provided on the test mold. The baffle plate includes a pair of baffle plates spaced apart in the first direction. In the third direction, the height of the lifting platform is kept flush with the height of the rolling surface of the asphalt mixture to park the rolling wheel, and the height of the test mold is equal to the height of the rut specimen.

[0008] In some embodiments of the present application, the test mold includes a first test mold and at least one second test mold. The at least one second test mold is stacked on the first test mold in the third direction. The first test mold includes a bottom plate and a plurality of side plates provided around the periphery of the bottom plate. The second test mold includes a plurality of side plates. The baffle plate is provided on the second test mold at the top of the test mold. The test mold is used to form a rut specimen with multiple layers of thickness.

[0009] In some embodiments of the present application, a detachable cushion plate is further provided between the base body and the mold.

[0010] In some embodiments of the present application, the rut forming device further includes a first moving assembly provided on the support platform. The first moving assembly includes a driving device, a first transmission mechanism, a first guide rail, and a first slider slidably connected to the first guide rail. The rolling wheel is connected to the first slider. The output shaft of the driving device is connected to the first transmission mechanism, and the output end of the first transmission mechanism is connected to the first slider to drive the rolling wheel to reciprocate in the second direction.

[0011] In some embodiments of the present application, the rolling wheel includes a hub and a wheel body pivotally connected to the hub. The rolling wheel is connected to the first slider through the hub.

[0012] In some embodiments of the present application, the first transmission mechanism includes a belt assembly or a chain assembly. The output shaft of the driving device is connected to the driving pulley of the belt assembly or the driving sprocket of the chain assembly. The belt of the belt assembly or the chain of the chain assembly is connected to the first slider.

[0013] In some embodiments of the present application, a displacement sensor is further provided on the first slider, and the displacement sensor is used to monitor the height of the rolling surface of the asphalt mixture along the third direction.

[0014] In some embodiments of the present application, the counterweight member includes a counterweight block and a loading device disposed between the counterweight block and the rolling wheel. The loading device is used to apply a variable load to the rolling wheel so that the rolling wheel can descend along the third direction and remain in contact with the rolling surface of the asphalt mixture.

[0015] In some embodiments of the present application, a second moving component is further provided between the base body and the mold, and the second moving component is used to drive the mold to move along the first direction.

[0016] In some embodiments of the present application, the second moving component includes a second transmission mechanism, a second guide rail, and a second slider slidably connected to the second guide rail. The second guide rail extends along the first direction and is connected to the base body. The mold is connected to the second slider, and the output end of the second transmission mechanism is connected to the second slider to drive the mold to move along the first direction.

[0017] In a second aspect, an embodiment of the present application further provides a rut specimen formed by using the rut forming device of the embodiment of the present application.

[0018] In a third aspect, an embodiment of the present application further provides a rut test device, including: a test chamber having a sealed accommodation cavity; and a rut test device disposed in the accommodation cavity. The rut test device includes: a base including a base body, a pair of lifting platforms disposed on the base body, and a mold. The pair of lifting platforms are spaced apart along the second direction, and the mold is located between the pair of lifting platforms and can move along the first direction. A rut specimen as in the embodiment of the present application is placed in the mold. The height of the lifting platform along the third direction is adjustable, and the first direction, the second direction, and the third direction intersect. A support frame is disposed on the base body, and the support frame includes a support platform suspended. A test wheel is located below the support platform and contacts the rut specimen. The test wheel can move relative to the support platform along the second direction. And a counterweight member is disposed on the support platform and connected to the test wheel. The counterweight member is used to apply a variable load to the test wheel. Wherein, the temperature of the accommodation cavity is set to a preset temperature. After the mold drives the rut specimen to move a first distance along the first direction, the test wheel reciprocates a preset number of times along the second direction in the mold at a preset speed to roll the rut specimen.

[0019] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Brief Description of the Drawings

[0020] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to denote the same components. Among them:

[0021] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to denote the same components. Among them:

[0022] Figure 1 is a schematic structural view of the rut forming device according to an embodiment of the present application along an angle;

[0023] Figure 2 is a schematic structural view of the rut forming device according to an embodiment of the present application along another angle;

[0024] Figure 3 is Figure 1 a schematic structural view of a mold in the rut forming device shown;

[0025] Figure 4 is Figure 1 a schematic structural view of another mold in the rut forming device shown;

[0026] Figure 5 is Figure 1 a schematic structural view of a support frame in the rut forming device shown;

[0027] Figure 6 is Figure 1 a schematic structural view of a base in the rut forming device shown;

[0028] Figure 7 is a schematic structural view of the rut test device according to an embodiment of the present application;

[0029] Figure 8 is a schematic structural view of the rut test equipment according to an embodiment of the present application.

[0030] The reference numerals in the drawings are represented as follows:

[0031] 1000, rut test equipment;

[0032] 100, rut forming device; X, first direction; Y, second direction; Z, third direction; 200, rut specimen; 300, test chamber; 400, rut test device;

[0033] 1. Base; 10. Base body; 11. Mold; 110. Test mold; 111. First test mold; 112. Second test mold; 113. Baffle plate; a. Bottom plate; b. Side plate; 12. Lifting platform; 13. Pad plate;

[0034] 2. Support frame; 21. Support platform; 22. Legs;

[0035] 3. rolling wheel; 31. wheel hub; 32. wheel body; 3', test wheel;

[0036] 4. counterweight; 40. loading device; 41. counterweight block;

[0037] 5. first moving assembly; 51. driving device; 52. first guide rail; 53. first slider; 54. displacement sensor; 55. first transmission mechanism; 551. transmission belt; 552. driving pulley; 553. driven pulley;

[0038] 6. Second moving assembly; 61. Second transmission mechanism; 62. Second guide rail; 63. Second slider;

[0039] 7. Sample rack. DETAILED DESCRIPTION

[0040] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0041] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0042] Although terms such as first, second, and third may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another region, layer, or section. Unless the context clearly indicates otherwise, terms such as "first" and "second" and other numerical terms do not imply an order or sequence when used herein. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0043] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will then be oriented as "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both the upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are to be interpreted accordingly.

[0044] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may also be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0046] Figure 1Schematic structural diagram of the rut forming device according to an embodiment of the present application at an angle. Figure 2 Schematic structural diagram of the rut forming device according to an embodiment of the present application at another angle.

[0047] Referring to Figure 1 and Figure 2 In an embodiment of the present application, a rut forming device 100 is provided, which includes a base 1, a support frame 2, a rolling wheel 3 and a counterweight 4.

[0048] The base 1 includes a base body 10, a pair of lifting platforms 12 arranged on the base body 10 and a mold 11. The pair of lifting platforms 12 are arranged at intervals along the second direction Y. The mold 11 is located between the pair of lifting platforms 12 and can move along the first direction X. The mold 11 contains asphalt mixture. The height of the lifting platform 12 along the third direction Z is adjustable. The first direction X, the second direction Y and the third direction Z intersect. The base body 10 can be a rectangular box, and the lifting platform 12 can be a lift. The height of the lifting platform 12 along the third direction Z is adjustable. For example, the height of the lifting platform 12 along the third direction Z is always kept level with the height of the rolling surface of the asphalt mixture in the mold 11.

[0049] The support frame 2 is arranged on the base body 10. The support frame 2 includes a suspended support platform 21. The support frame 2 further includes a plurality of legs 22 connected to the support platform 21, such as three or four legs 22. The support platform 21 is suspended by the plurality of legs 22. The orthographic projection of the support platform 21 on the base body 10 covers the orthographic projections of the pair of lifting platforms 12 and the mold 11 on the base body 10. A sample rack 7 can also be arranged on the base body 10. The sample rack 7 is located on one side of the support platform 21 and is used for storing the mold 11.

[0050] The rolling wheel 3 is located below the support platform 21 and contacts the rolling surface of the asphalt mixture. The rolling wheel 3 can move relative to the support platform 21 along the second direction Y and lift along the third direction Z.

[0051] The counterweight 4 is arranged on the support platform 21 and is connected to the rolling wheel 3. The counterweight 4 is used to apply a variable load to the rolling wheel 3. For example, the initial load applied by the counterweight 4 to the rolling wheel 3 is 0.7 MPa, and then it gradually increases to 1.0 MPa, so as to more realistically simulate the actual rolling pressure of "from light to heavy" applied at the construction site and compact the asphalt mixture in the mold 11 as much as possible.

[0052] Wherein, after the mold 11 moves a preset distance along the first direction X, the rolling wheel 3 reciprocates in the mold 11 along the second direction Y, and the rolling wheel 3 can descend along the third direction Z as the rolling surface of the asphalt mixture descends, so as to roll the asphalt mixture into a rut specimen 200. The preset distance is less than the width of the rolling wheel 3.

[0053] In this embodiment, a variable load is applied to the rolling wheel 3 through the counterweight 4 so that the rolling wheel 3 can keep in contact with the rolling surface of the asphalt mixture. During the rolling and forming process of the asphalt mixture, the asphalt mixture is rolled from a loose state to a dense state, causing the displacement of the rolling surface of the asphalt mixture in the third direction Z to decrease. For example, the height of the asphalt mixture in the loose state is 50 mm, and the height after being rolled to the dense state is 40 mm. At the same time, the rolling wheel 3 can descend along the third direction Z as the rolling surface of the asphalt mixture descends.

[0054] Further, after the mold 11 moves a preset distance along the first direction X, the rolling wheel 3 reciprocates within the mold 11 along the second direction Y. The preset distance is less than the width of the rolling wheel 3. For example, the width of the rolling wheel 3 is 80 mm, and the preset distance is 60 mm. Thus, staggered-wheel rolling can be achieved, that is, the rolling wheel 3 rolls section by section from one side to the other side of the mold 11 along the first direction X, ensuring that the rolling wheel 3 can repeatedly roll at least part of the asphalt mixture during the previous rolling process every time it moves back and forth along the second direction Y, so as to compact the asphalt mixture in the baffle box mold 11 and reduce the porosity of the asphalt mixture between two adjacent rollings. For example, the porosity can be as low as 2% - 4%. Compared with the full-width kneading of the asphalt mixture by a circular arc roller mill similar to a steel drum roller in the related art, it can more realistically simulate the shear rolling of the roller in the construction site with "half-wheel overlap", and finally roll the asphalt mixture into the rut specimen 200. The height dimension of the rut specimen 200 is determined according to the relevant standards of the rut test, such as "Test Regulations for Bitumen and Bituminous Mixtures for Highway Engineering".

[0055] In addition, the width of the rolling wheel 3 in this embodiment is greater than the width of the standard test wheel. For example, the diameter dimension of the standard test wheel is generally φ200 mm, and the width dimension is 50 mm. The diameter dimension of the rolling wheel 3 can be φ200 mm, and the width dimension is 80 mm. Since the rolling wheel 3 has a relatively large number of rolling times and a small porosity in the half-wheel overlap area of two adjacent ruts during the rolling process, while the non-overlap area has a relatively large porosity. The width of the rolling wheel 3 being greater than the width of the standard test wheel can ensure that when the standard test wheel is used to conduct a rolling test on the rut specimen 200 subsequently, the rut of the standard test wheel can avoid the area with a relatively large porosity that may appear during the specimen forming process, which is beneficial to increasing the evaluation credibility of the high-temperature rutting resistance of the asphalt mixture.

[0056] The rolling and forming steps of the rut specimen 200 are as follows: Place the mold 11 between a pair of lifting platforms 12, load a certain mass of asphalt mixture into the mold 11, adjust the height of the lifting platform 12 in the third direction Z to be flush with the height of the rolling surface of the asphalt mixture in the mold 11 so that the rolling wheel 3 can be parked on the lifting platform 12; Place the rolling wheel 3 on one side of the mold 11 along the first direction X, apply a variable load to the rolling wheel 3 through the counterweight 4 so that the rolling wheel 3 remains in contact with the rolling surface of the asphalt mixture, and then control the mold 11 to move a preset distance along the first direction X (the preset distance is less than the width of the rolling wheel 3), then control the rolling wheel 3 to move back and forth along the second direction Y at a certain speed for at least once, then the mold 11 continues to move a preset distance along the first direction X, the rolling wheel 3 descends a certain distance along the third direction Z, and moves back and forth along the second direction Y at a certain speed again for at least once to achieve staggered wheel rolling. Finally, the rolling wheel 3 rolls the loose asphalt mixture section by section from one side to the other side of the mold 11 along the first direction X and rolls the loose asphalt mixture to the standard height of the rut specimen 200 to complete the rolling and forming of the rut specimen 200.

[0057] According to the rut forming device 100, rut specimen 200 and rut test device 1000 provided by the embodiments of the present application, a variable load, such as from light to heavy, is applied to the rolling wheel 3 through the counterweight 4 so that the rolling wheel 3 remains in contact with the rolling surface of the asphalt mixture, and after the mold 11 is moved a preset distance along the first direction X, the rolling wheel 3 is driven to reciprocate along the second direction Y in the mold 11 to roll and form the asphalt mixture in the mold 11 into the rut specimen 200; Since the load applied by the counterweight 4 to the rolling wheel 3 is variable and the preset distance that the mold 11 moves along the first direction X is less than the width of the rolling wheel 3, the working condition of the roller in the construction site "from light to heavy, overlapping half a wheel" can be truly simulated, the high temperature rutting resistance of the asphalt pavement can be more accurately reflected, and the evaluation credibility of the high temperature rutting resistance of the asphalt mixture can be increased.

[0058] Figure 3 For Figure 1 A schematic structural diagram of the mold in the rut forming device shown.

[0059] In some embodiments, the mold 11 includes a test mold 110 and a baffle 113 provided on the test mold 110. The baffle 113 includes a pair of baffles spaced along the first direction X. In the third direction Z, the height of the lifting platform 12 is flush with the height of the rolling surface of the asphalt mixture to park the rolling wheel 3, and the height of the test mold 110 is equal to the height of the rut specimen 200.

[0060] Such as Figure 3As shown, the height of the trial mold 110 is equal to the height of the formed rut specimen 200. For example, the size of the formed rut specimen 200 is 300 mm × 300 mm × 50 mm, and the height of the trial mold is 50 mm. Before the rolling wheel 3 rolls the asphalt mixture in the mold 11, the asphalt mixture is in a fluffy state with a relatively high height. A pair of baffles spaced along the first direction X and a pair of rolling platforms 12 spaced along the second direction Y on the trial mold 110 jointly limit the overflow of the fluffy asphalt mixture from the trial mold, avoiding the loss of the asphalt mixture during the rolling process and affecting the density of the rut specimen 200. When the height of the rolling surface of the asphalt mixture gradually decreases after being rolled by the rolling wheel 3, the height of the lifting platform 12 also decreases until it is flush with the height of the trial mold 110.

[0061] Figure 4 For Figure 1 Another structural schematic diagram of the mold in the rut forming device shown.

[0062] In some embodiments, the trial mold 110 includes a first trial mold 111 and at least one second trial mold 112. The at least one second trial mold 112 is stacked on the first trial mold 111 along the third direction Z. The first trial mold 111 includes a bottom plate a and a plurality of side plates b arranged around the peripheral side of the bottom plate a. The second trial mold 112 includes a plurality of side plates b. The baffle plate 113 is arranged on the second trial mold 112 at the top of the trial mold. The trial mold is used to form a rut specimen 200 with multiple layers of thickness.

[0063] According to the general test procedures in the industry, for asphalt mixtures with a nominal maximum aggregate size less than or equal to 19 mm, the height of the formed rut specimen 200 is 50 mm; for asphalt mixtures with a nominal maximum aggregate size less than or equal to 26.5 mm, the height of the formed rut specimen 200 is preferably 80 mm - 100 mm. Currently, most highway project designs involve two or more types of mixtures. Therefore, at least two or more types of rut specimens 200 with different heights need to be configured to meet the specification requirements.

[0064] As Figure 4As shown, the first trial mold 111 includes a bottom plate a and a plurality of side plates b arranged around the peripheral side of the bottom plate a. The second trial mold 112 includes a plurality of side plates b. At least one second trial mold 112 is stacked on the first trial mold 111 along the third direction Z. The length and width dimensions of both the first trial mold 111 and the second trial mold 112 can be 300mm x 300mm, or 500mm x 300mm. The height dimensions of the first trial mold 111 and the second trial mold 112 are determined according to the rutting test method. In one example, the trial mold includes a first trial mold 111 and two second trial molds 112 stacked. The first trial mold 111 is used to mold one kind of mixture with a height of 80mm. The first second trial mold 112 is used to mold another kind of mixture with a height of 60mm. The second second trial mold 112 is used to mold another kind of mixture with a height of 40mm. This can more realistically simulate the rolling method of the structural layer of the roller at the construction site. The height dimension of the rut specimen 200 after rolling and forming is 180mm. The mass of the formed rut specimen 200 is determined according to the volume dimension of the trial mold and the Marshall standard density multiplied by a constant, and this constant can be 1.03 for example.

[0065] It can be understood that in other embodiments, the mold 11 may also only include the first trial mold 111 and the baffle plate 113 arranged on the first trial mold 111, which will not be elaborated here.

[0066] In some embodiments, a detachable cushion plate 13 is further arranged between the base body 10 and the mold 11.

[0067] In this embodiment, the lifting platform 12 can be a lift. If the height of the mold 11 cannot be adapted to the height of the lifting platform 12, a detachable cushion plate 13 can be arranged between the base body 10 and the first trial mold 111 at the bottom of the mold 11. There can be many kinds of heights for the cushion plate 13. The height of the mold 11 is adjusted by the cushion plate to make the height of the mold 11 adapted to the height of the lifting platform 12 and form rut specimens 200 with various heights.

[0068] Figure 5 For Figure 1 The structural schematic diagram of the support frame in the rut forming device shown.

[0069] In some embodiments, the rut forming device 100 further includes a first moving component 5 arranged on the support platform 21. The first moving component 5 includes a driving device 51, a first transmission mechanism 55, a first guide rail 52, and a first slider 53 slidably connected to the first guide rail 52. The rolling wheel 3 is connected to the first slider 53. The output shaft of the driving device 51 is connected to the first transmission mechanism 55, and the output end of the first transmission mechanism 55 is connected to the first slider 53 to drive the rolling wheel 3 to reciprocate along the second direction Y.

[0070] Refer to Figure 5, the first moving component 5 has various implementation forms and can drive the rolling wheel 3 to move manually or automatically. In one example, the first moving component 5 includes a driving device 51, a first transmission mechanism 55, a first guide rail 52, and a first slider 53 slidably connected to the first guide rail 52. The driving device 51 can be any one of a servo motor, a stepper motor, or a linear cylinder. The rolling wheel 3 is connected to the first slider 53, and the first transmission mechanism 55 is used to drive the rolling wheel 3 to reciprocate along the second direction Y. Optionally, two spaced-apart first guide rails 52 are both slidably connected to the first slider 53 to ensure the balance of the first slider 53 during movement.

[0071] In some embodiments, the rolling wheel 3 includes a wheel hub 31 and a wheel body 32 pivotally connected to the wheel hub 31. The rolling wheel 3 is connected to the first slider 53 through the wheel hub 31.

[0072] Optionally, the wheel body 32 includes a steel wheel body and a flexible member coated on the outer periphery of the steel wheel body. The flexible member can be, for example, a rubber-like rubber coating material. The hardness of the rubber coating material can refer to the tires of large trucks and can withstand high temperatures up to 200°C.

[0073] In some embodiments, the first transmission mechanism 55 includes a belt transmission assembly or a chain transmission assembly. The output shaft of the driving device 51 is connected to the driving pulley 552 of the belt transmission assembly or the driving sprocket of the chain transmission assembly. The transmission belt 551 of the belt transmission assembly or the transmission chain of the chain transmission assembly is connected to the first slider 53.

[0074] As Figure 5 shown, in one example, the first transmission mechanism 55 includes a belt transmission assembly. The belt transmission assembly includes a driving pulley 552, a driven pulley 553, and a transmission belt 551 connected between the driving pulley 552 and the driven pulley 553. The output shaft of the driving device 51 is connected to the driving pulley 552. The transmission belt 551 extends along the second direction Y. The first slider 53 is connected to the transmission belt 551 to drive the rolling wheel 3 to reciprocate along the second direction Y. The number of belt transmission assemblies can be two groups. The two belt transmission assemblies are spaced apart and both connected to the first slider 53 to ensure the balance of the first slider 53 when driving the rolling wheel 3 to move. In other examples, the first transmission mechanism 55 can also include a chain transmission assembly, which will not be elaborated here.

[0075] In some embodiments, a displacement sensor 54 is further provided on the first slider 53. The displacement sensor 54 is used to monitor the height of the rolling surface of the asphalt mixture along the third direction Z. The displacement sensor 54 can be any one of an infrared sensor, an optoelectronic sensor, and an image sensor. As described above, in one example, the height of the asphalt mixture in the loose state is 50 mm, and the height of the asphalt mixture after being rolled by the rolling wheel 3 to the dense state is 40 mm. At this time, the displacement sensor 54 does not work. When the height of the asphalt mixture is rolled to be lower than the threshold value, for example, the threshold value can be 30 mm, the displacement sensor 54 sends an electrical signal. At this time, the counterweight 4 applies a greater load to the rolling wheel 3 so that the rolling wheel 3 can descend along the third direction Z as the rolling surface of the asphalt mixture descends.

[0076] In some embodiments, the counterweight 4 includes a counterweight block 41 and a loading device 40 disposed between the counterweight block 41 and the rolling wheel 3. The loading device 40 is used to apply a variable load to the rolling wheel 3 so that the rolling wheel 3 can descend along the third direction Z and keep in contact with the rolling surface of the asphalt mixture. The loading device 40 can be a pneumatic booster cylinder, which is used to provide additional counterweight to the rolling wheel 3 and can also push the rolling wheel 3 to descend along the third direction Z as the rolling surface of the asphalt mixture descends. In this embodiment, the mass of the counterweight block 41 is about 70 kg, and the constant load pressure that the counterweight block 41 can apply to the rolling wheel 3 is 0.7 MPa. When additional counterweight is needed, the loading device 40 can be started, and the loading device 40 can provide an additional maximum counterweight of 85 kg. For example, the pressure load that the counterweight 4 and the loading device 40 can jointly apply to the rolling wheel 3 can reach at least 1.0 MPa, and the specific load can be determined according to the width of the rolling wheel 3.

[0077] Figure 6 For Figure 1 the structural schematic diagram of the base in the shown rut forming device.

[0078] In some embodiments, a second moving component 6 is further provided between the base body 10 and the mold 11. The second moving component 6 is used to drive the mold 11 to move along the first direction X.

[0079] Refer to Figure 6 , there are various structural forms of the second moving component 6, and the mold 11 can be driven to move manually or automatically.

[0080] In some embodiments, the second moving component 6 includes a second transmission mechanism 61, a second guide rail 62, and a second slider 63 slidably connected to the second guide rail 62. The second guide rail 62 extends along the first direction X and is connected to the base body 10. The mold 11 is connected to the second slider 63, and the output end of the second transmission mechanism 61 is connected to the second slider 63 to drive the mold 11 to move along the first direction. When a detachable backing plate 13 is provided between the base body 10 and the mold 11, the backing plate 13 is connected to the second slider 63.

[0081] In this embodiment, the second moving component 6 can drive the mold 11 to move manually. Optionally, the second transmission mechanism 61 includes a lead screw and a nut screwed onto the lead screw. The lead screw is connected to the second guide rail 62, and the nut is connected to the second slider 63. A driving handle is provided at one end of the lead screw. By rotating the driving handle, the rotational motion of the lead screw can be converted into a linear motion to drive the second slider 63 to move along the first direction X, thereby driving the mold 11 to move along the first direction X.

[0082] In other examples, the second moving component 6 may further include any one of a servo motor, a stepper motor, and a cylinder to drive the mold 11 to move automatically.

[0083] In addition, an embodiment of the present application further provides a rut specimen 200 formed by using the rut forming device 100 of the embodiment of the present application.

[0084] Figure 7 It is a schematic structural diagram of the rut test device of the embodiment of the present application. Figure 8 It is a schematic structural diagram of the rut test equipment of the embodiment of the present application.

[0085] Referring to Figure 7 and Figure 8 An embodiment of the present application further provides a rut test equipment 1000, including a test chamber 300 and a rut test device 400.

[0086] The test chamber 300 has a sealed accommodation cavity, and the rut test device 400 is disposed in the accommodation cavity. Among them, the rut test device 400 can share the structure of the rut forming device 100 of the embodiment of the present application. The difference is that the rut specimen 200 of the embodiment of the present application is placed in the mold 11, the rolling wheel 3 is replaced by a test wheel 3', and the width of the test wheel 3' is smaller than the width of the rolling wheel 3. Specifically, the rut test device 400 includes a base 1, a support frame 2, a test wheel 3', and a counterweight 4.

[0087] The base 1 includes a base body 10, a pair of lifting platforms 12 disposed on the base body 10, and a mold 11. The pair of lifting platforms 12 are spaced apart along the second direction Y. The mold 11 is located between the pair of lifting platforms 12 and can move along the first direction X. A rut specimen 200 as in the embodiment of the present application is placed in the mold 11. The height of the lifting platform 12 is adjustable along the third direction Z. The first direction X, the second direction Y, and the third direction Z intersect.

[0088] The support frame 2 is disposed on the base body 10. The support frame 2 includes a support platform 21 that is suspended.

[0089] The test wheel 3' is located below the support platform 21 and contacts the rut specimen 200. The test wheel 3' can move relative to the support platform 21 along the second direction Y.

[0090] The counterweight 4 is disposed on the support platform 21 and is connected to the test wheel 3'. The counterweight 4 is used to apply a variable load to the test wheel 3'.

[0091] Wherein, the temperature of the accommodation cavity is set to a preset temperature. After the mold 11 drives the rut specimen 200 to move a first distance along the first direction X, the test wheel 3' reciprocates a preset number of times along the second direction Y in the mold at a preset speed to roll over the rut specimen 200.

[0092] In this embodiment, the test chamber 300 has a sealed accommodation cavity, which can prevent the temperature from decreasing, so that the accommodation cavity maintains a constant temperature of 60°C, or other test temperatures. The accommodation cavity is opened or closed through the door body. A computer system and temperature control components are provided in the accommodation cavity, which can keep warm and control the temperature. The rut test device 400 connected to the accommodation cavity can control the test time and set relevant parameters, such as the counterweight pressure, temperature, time, moving speed of the rolling wheel 3, counterweight load, etc.

[0093] The width of the test wheel 3' of the rut test device 400 is smaller than the width of the rolling wheel 3. There are two sizes of the standard test wheel 3'. One is the standard test wheel 3' for scientific research, with a diameter size of φ200mm and a height size of 75mm. The counterweight block 41 applies a constant load pressure of 0.7MPa to the test wheel. The other is the standard test wheel 3' for testing, with a diameter size of φ200mm and a height size of 50mm. The counterweight block 41 applies a constant load pressure of 0.7MPa to the standard test wheel 3'. If the load pressure needs to be higher than 0.7MPa, the counterweight block 41 and the loading device 40 are used to apply a pressure of at least 1.0MPa together.

[0094] The steps for the rut test equipment 1000 to conduct a rut test are as follows:

[0095] Place the rutting test device 400 in the sealed accommodation cavity of the test chamber 300. Among them, the test wheel 3' is placed on one side of the mold 11 along the first direction X, the formed rutting specimen 200 is placed in the mold 11 of the base body 10, and the height of the lifting platform 12 along the third direction Z is adjusted to be flush with the height of the rutting specimen 200.

[0096] Adjust various parameters of the test chamber 300. For example, the overall machine temperature is maintained at 60 °C, the test time is 1 hour, the moving speed and number of movements of the mold 11 along the first direction X, the moving speed and number of movements of the standard test wheel 3' along the second direction Y, the counterweight pressure, etc., to truly simulate the working condition of the roller compaction on the construction site "from light to heavy, overlapping half a wheel"; for example, in this embodiment, the number of movements of the mold 11 along the first direction X and the number of movements of the standard test wheel 3' along the second direction Y can be 42 times per minute, totaling 2520 times; the counterweight pressure can be 0.7 MPa or 1.0 Mpa; of course, the various parameters of the test chamber 300 can also be other parameters, which can be arbitrarily set according to the test scenario.

[0097] Start the test chamber 300, apply a load to the test wheel 3' through the counterweight 4, then control the mold 11 to move a first distance along the first direction X (this first distance is greater than the preset distance when forming the rutting specimen 200), then control the test wheel 3' to move repeatedly along the second direction Y at a certain speed, then the mold 11 continues to move the first distance along the first direction X, and the test wheel 3' moves repeatedly along the second direction Y again at a certain speed to achieve staggered wheel compaction. Finally, the test wheel 3' is gradually compacted from one side of the mold 11 along the first direction X to the other side until the preset number of movements is completed.

[0098] After the test is completed, check the compaction condition of the rutting specimen 200.

[0099] Thus, in the rutting test device 400 in the rutting test equipment 1000 of the embodiment of the present application, the rutting test device 400 and the rutting forming device 100 can share multiple components and be combined into one. The structure is relatively simple. A reliable rutting specimen 200 is obtained by truly simulating the working condition of the roller compaction on the construction site "from light to heavy, overlapping half a wheel", reducing the influence of the quality loss of the asphalt mixture on the test data, etc. It can fully simulate the real situation of the road surface compaction during on-site construction and use, correct the rutting test, increase the evaluation credibility of the high-temperature rutting resistance of the asphalt mixture, and make the test results more referenceable.

[0100] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A rutting device, characterized in that: include: A base, comprising a base body, a pair of lifting platforms arranged on the base body and a mold, wherein the pair of lifting platforms are arranged at intervals along the second direction, the mold is located between the pair of lifting platforms and can move along the first direction, asphalt mixture is contained in the mold, the height of the lifting platform along the third direction is adjustable, and the first direction, the second direction and the third direction are arranged to intersect; A support frame is arranged on the base body, and the support frame includes a support platform arranged in suspension; a rolling wheel, located below the support platform and in contact with the rolling surface of the asphalt mixture, the rolling wheel being able to move relative to the support platform along the second direction and to rise and fall along the third direction; and A counterweight, disposed on the support platform and connected to the rolling wheel, the counterweight being used to apply a variable load to the rolling wheel; Among them, after the mold moves a preset distance along the first direction, the rolling wheel reciprocates in the mold along the second direction, and the rolling wheel can descend along the third direction as the rolling surface of the asphalt mixture descends, so as to roll the asphalt mixture into a rutting specimen, and the preset distance is smaller than the width of the rolling wheel.

2. The rutting device according to claim 1, characterized in that: The mold includes a test mold and a material baffle plate arranged on the test mold, the material baffle plate includes a pair of baffles arranged at intervals along the first direction, and in the third direction, the height of the lifting platform is kept level with the height of the rolling surface of the asphalt mixture to park the rolling wheel, and the height of the test mold is equal to the height of the rutting specimen.

3. The rutting device according to claim 2, characterized in that: The test mold includes a first test mold and at least one second test mold, at least one second test mold is stacked on the first test mold along the third direction, the first test mold includes a bottom plate and a plurality of side plates arranged around the circumference of the bottom plate, the second test mold includes a plurality of the side plates, the material baffle plate is arranged on the second test mold at the top of the test mold, and the test mold is used to form the rutting specimen with multiple layers of thickness.

4. The rutting device according to claim 1, characterized in that: A detachable pad is also provided between the base body and the mold.

5. The rutting device according to any one of claims 1 to 4, characterized in that: The rut forming device also includes a first movable component arranged on the supporting platform, the first movable component includes a driving device, a first transmission mechanism, a first guide rail and a first slider slidably connected to the first guide rail, the rolling wheel is connected to the first slider, the output shaft of the driving device is connected to the first transmission mechanism, and the output end of the first transmission mechanism is connected to the first slider to drive the rolling wheel to reciprocate along the second direction.

6. The rutting device according to claim 5, characterized in that: The rolling wheel comprises a wheel hub and a wheel body pivotally connected to the wheel hub, and the rolling wheel is connected to the first sliding block via the wheel hub.

7. The rutting device according to claim 5, characterized in that: The first transmission mechanism includes a transmission belt assembly or a conveyor chain assembly, the output shaft of the driving device is connected to the driving pulley of the transmission belt assembly or the driving sprocket of the conveyor chain assembly, and the transmission belt of the transmission belt assembly or the transmission chain of the conveyor chain assembly is connected to the first slider.

8. The rutting device according to claim 5, characterized in that: The first sliding block is also provided with a displacement sensor, and the displacement sensor is used to monitor the height of the rolling surface of the asphalt mixture along the third direction.

9. The rutting device according to any one of claims 1 to 4, characterized in that: The counterweight comprises a counterweight block and a loading device disposed between the counterweight block and the rolling wheel, wherein the loading device is used to apply a variable load to the rolling wheel so that the rolling wheel can descend along the third direction and maintain contact with the rolling surface of the asphalt mixture.

10. The rutting device according to any one of claims 1 to 4, characterized in that: A second moving component is also arranged between the base body and the mold, and the second moving component is used to drive the mold to move along the first direction.

11. The rutting device according to claim 10, characterized in that: The second moving component includes a second transmission mechanism, a second guide rail and a second slider slidably connected to the second guide rail, the second guide rail extends along the first direction and is connected to the base body, the mold is connected to the second slider, and the output end of the second transmission mechanism is connected to the second slider to drive the mold to move along the first direction.

12. A rutting specimen, characterized in that: The rutting is performed using the rutting device as described in any one of claims 1 to 11.

13. A rutting test device, characterized in that: include: A test chamber, having a sealed containing chamber; and A rutting test device is arranged in the accommodating chamber, wherein the rutting test device comprises: A base, comprising a base body, a pair of lifting platforms arranged on the base body and a mold, wherein the pair of lifting platforms are arranged at intervals along the second direction, the mold is located between the pair of lifting platforms and can move along the first direction, the rutting test piece according to claim 12 is placed in the mold, the height of the lifting platform along the third direction is adjustable, and the first direction, the second direction and the third direction are arranged to intersect; A support frame is arranged on the base body, and the support frame includes a support platform arranged in suspension; a test wheel, located below the support platform and in contact with the rutting test piece, the test wheel being movable relative to the support platform along the second direction; and a counterweight, disposed on the support platform and connected to the test wheel, the counterweight being used to apply a variable load to the test wheel; The temperature of the accommodating chamber is set to a preset temperature, and after the mold drives the rutting specimen to move a first distance along the first direction, the test wheel reciprocates in the mold along the second direction for a preset number of times at a preset speed to roll over the rutting specimen.

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