Asphalt stress absorption layer for delaying cement reflective cracks and preparation method thereof

Abstract

The present invention provides an asphalt stress absorbing layer for delaying cement reflective cracks and a preparation method thereof, comprising an adhesive layer, wherein a crushed stone layer is embedded in the interior of the adhesive layer, and a reinforcement layer is provided on the top surface of the adhesive layer. The invention lays a reinforcement layer in a honeycomb mesh arrangement through a reinforcement laying mechanism, which is well interlocked with the adhesive layer and the crushed stone layer to form a high-strength shear stress absorbing layer, cuts off the shear arc of vehicle load, reduces the bending deformation of the surface layer, reduces the rutting and pushing effects caused by vehicle loads, thereby improving the use condition of the road surface, and more importantly, improves the durability of the asphalt stress absorbing layer and extends its service life.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering materials, and in particular to an asphalt stress absorption layer for delaying cement reflective cracks and a preparation method thereof. Background Art

[0002] When reinforcing old concrete pavement, a layer of asphalt overlay is often added on the original pavement. When the tensile stress generated by the concrete displacement exceeds the tensile strength of the asphalt overlay, the overlay will crack. This type of crack is called reflection crack.

[0003] Reflective cracks have always been a serious asphalt pavement problem. Using a stress absorbing layer to prevent and control reflective cracks is currently recognized as a more effective treatment method.

[0004] The existing rubber asphalt stress absorption layer is made by evenly spreading stones of a single particle size on the rubber asphalt layer and using a rubber-wheel roller to squeeze and roll the rubber asphalt. The rubber asphalt is squeezed to about 3 / 4 of the stone height. After the stones are interlocked, they will form a structural support. The road surface with a crushed stone seal pattern formed at this time is the rubber asphalt stress absorption layer.

[0005] The paving method is to evenly spread the asphalt mixture and the crushed stone at the same time. After forming, it is dense, has strong adhesion, and is impermeable. It has good bonding performance with the cement concrete base and can deform with the deformation of the base. However, since the formed stress absorption layer is relatively thin, compared with the cement concrete base and the asphalt pavement cover, its durability is lower and its life is shorter, and the construction cost of adding mesh reinforcement is higher. Summary of the invention

[0006] In view of the above problems, the present invention provides an asphalt stress absorption layer for delaying cement reflective cracks and a preparation method, the purpose of which is to solve the technical problems of low durability and short life of the existing asphalt stress absorption layer mentioned in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: an asphalt stress absorption layer for delaying cement reflective cracks, comprising an adhesive layer, a crushed stone layer is embedded in the adhesive layer, and a reinforcement layer is provided on the top surface of the adhesive layer.

[0008] Furthermore, the bonding layer is a mixture of rubber asphalt, diluent, fiber material, and concrete interface adhesive.

[0009] Furthermore, the crushed stone layer is single-size crushed stone pre-coated with asphalt, and its coverage rate is 50-60%.

[0010] Furthermore, the reinforcement layer is arranged in a honeycomb mesh shape, the height of which is 1.5-2 times the single particle diameter of the crushed stone layer, and the material is rubber asphalt.

[0011] Furthermore, the reinforcement layer and the bonding layer are fused with each other without obvious boundaries.

[0012] According to the above technical solution of an asphalt stress absorbing layer for delaying cement reflective cracks, a preparation method of an asphalt stress absorbing layer for delaying cement reflective cracks is also provided, comprising the following steps:

[0013] S1. Base treatment: roughening and cleaning the surface of the semi-rigid base;

[0014] S2. Synchronous spreading: Spreading the bonding layer and the gravel layer synchronously by engineering vehicles;

[0015] S3. Rubber wheel rolling: Roll the gravel layer with a tire roller to position the gravel layer; the distance between the roller and the engineering vehicle in step S2 is no more than 5m;

[0016] S4. Laying reinforcement: installing a reinforcement laying mechanism at the rear of the roller in step S3, and laying the reinforcement layer by the reinforcement laying mechanism;

[0017] S5. Curing and maintenance: After the temperature of the bonding layer and the reinforcement layer drops, traffic is opened to construction vehicles and the asphalt surface layer is laid.

[0018] Furthermore, the reinforced paving mechanism includes a reinforced material bin, which is arranged at the rear of the roller, and the output end of the reinforced material bin is connected to multiple material distribution units through a hose, and material distribution brackets are symmetrically provided at both ends of the multiple material distribution units, and the upper ends of the multiple material distribution brackets are all arranged at the bottom of the reinforced material bin, and material distribution rollers are respectively provided inside the multiple material distribution units, and the two ends of the multiple material distribution rollers are respectively rotatably connected to the lower ends of the multiple material distribution brackets, and the two ends of the multiple material distribution rollers are respectively coaxially connected to linkage gears, and the multiple linkage gears are meshed with each other, and an intermittent driving mechanism is provided at one end of one of the material distribution rollers, and the intermittent driving mechanism is arranged on one side of the lower part of one of the material distribution brackets.

[0019] Furthermore, the material distribution unit includes a main material collection pipe, the middle part of which is connected to the output end of the reinforced silo through the hose, a plurality of material distribution branch pipes are provided at the lower part of the main material collection pipe, the lower ends of the plurality of material distribution branch pipes are all provided at the upper part of the material distribution cylinder, the material parting roller is provided inside the material distribution cylinder, and a discharge trough is provided at the lower part of the material distribution cylinder.

[0020] Furthermore, a plurality of spiral parting grooves are provided on the outer side of the cloth parting roller.

[0021] Furthermore, the intermittent drive mechanism includes a drive motor, which is arranged on one side of the lower part of the cloth support, and the output end of the drive motor is coaxially connected to an active dial, the active dial is engaged with a groove wheel, and the groove wheel is coaxially connected to one end of one of the cloth parting rollers.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The reinforced layer is laid out in a honeycomb mesh through the reinforced laying mechanism, which interlocks well with the bonding layer and the gravel layer to form a high-strength shear stress absorption layer, cuts off the shear arc of vehicle load, reduces the bending deformation of the surface layer, and reduces the rutting and pushing effects caused by vehicle loads, thereby improving the road surface condition. More importantly, it improves the durability of the asphalt stress absorption layer and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the asphalt stress absorbing layer of the present invention;

[0025] Figure 2 It is a schematic cross-sectional view of the structure of the asphalt stress absorbing layer of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the asphalt stress absorbing layer of the present invention;

[0027] Figure 4 It is a schematic diagram of the appearance structure of the reinforcement laying mechanism of the present invention;

[0028] Figure 5 It is a schematic diagram of the internal structure of the reinforcement laying mechanism of the present invention;

[0029] Figure 6 It is a schematic cross-sectional view of the internal structure of the non-reinforced laying mechanism of the present invention;

[0030] Figure 7 It is a schematic cross-sectional view of the fabric unit structure of the present invention;

[0031] Figure 8 It is a schematic diagram of the disassembly of the intermittent drive mechanism structure of the present invention.

[0032] In the figure: 1. bonding layer; 2. crushed stone layer; 3. reinforcement layer; 4. semi-rigid base layer; 5. reinforcement laying mechanism; 51. reinforcement silo; 52. material distribution unit; 521. aggregate main pipe; 522. material distribution branch pipe; 523. material distribution cylinder; 524. material discharge trough; 53. material distribution bracket; 54. material distribution parting roller; 541. spiral parting groove; 55. linkage gear; 56. intermittent drive mechanism; 561. drive motor; 562. active dial; 563. groove wheel; 6. asphalt surface layer. DETAILED DESCRIPTION

[0033] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0034] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] For example, please refer to Figure 1-3 , an asphalt stress absorption layer for delaying cement reflective cracks, comprising an adhesive layer 1, a crushed stone layer 2 is embedded in the adhesive layer 1, a reinforcement layer 3 is provided on the top surface of the adhesive layer 1, the adhesive layer 1 is a mixture of rubber asphalt, a diluent, a fiber material, and a concrete interface adhesive, the crushed stone layer 2 is a single-particle crushed stone pre-wrapped with asphalt, and its coverage rate is 50-60%, the reinforcement layer 3 is arranged in a honeycomb mesh, and its height is 1.5-2 times the single particle size of the crushed stone layer 2, and the material is rubber asphalt, the reinforcement layer 3 and the adhesive layer 1 are fused with each other without obvious boundaries, this design forms a high-strength shear stress absorption layer through the reinforcement layer arranged in a honeycomb mesh, the adhesive layer and the crushed stone layer are well bitten and squeezed, the vehicle load shear arc is cut off, the surface layer bending deformation is reduced, and the rutting and push effects caused by the vehicle load are reduced, thereby improving the road surface use condition, and more importantly, improving the durability of the asphalt stress absorption layer and extending its life.

[0037] According to the above embodiments, a method for preparing an asphalt stress absorbing layer for delaying cement reflective cracks is also provided, comprising the following steps:

[0038] S1. Base treatment: roughening and cleaning the surface of the semi-rigid base 4;

[0039] S2. Synchronous spreading: Synchronous spreading of the bonding layer 1 and the gravel layer 2 by engineering vehicles;

[0040] S3. Rubber wheel rolling: Roll with a tire roller once to position the gravel layer 2; the distance between the roller and the engineering vehicle in step S2 is no more than 5m;

[0041] S4. Laying reinforcement: Installing a reinforcement laying mechanism 5 at the rear of the roller in step S3, and laying the reinforcement layer 3 by the reinforcement laying mechanism 5;

[0042] S5. Maintenance: After the temperature of the bonding layer 1 and the reinforcement layer 3 drops, traffic is opened to construction vehicles and the asphalt surface layer 6 is laid. This design is approved.

[0043] For example, please refer to Figure 4-8The reinforced laying mechanism 5 includes a reinforced silo 51, which is arranged at the rear of the roller. The output end of the reinforced silo 51 is connected to a plurality of material distribution units 52 through a hose. The material distribution units 52 include a material collection main pipe 521. The middle part of the material collection main pipe 521 is connected to the output end of the reinforced silo 51 through the hose. The lower part of the material collection main pipe 521 is provided with a plurality of material distribution branch pipes 522. The lower ends of the plurality of material distribution branch pipes 522 are all arranged at the upper part of a material distribution cylinder 523. The material distribution cylinder 523 is provided with a material distribution parting roller 54 inside. The lower part of the material distribution cylinder 523 is provided with a discharge trough 5 24, a plurality of cloth-distributing units 52 are symmetrically provided with cloth-distributing brackets 53 at both ends, the upper ends of the plurality of cloth-distributing brackets 53 are all arranged at the bottom of the reinforced silo 51, and a plurality of cloth-distributing rollers 54 are respectively arranged inside the plurality of cloth-distributing units 52, and a plurality of spiral parting grooves 541 are opened on the outer side of the cloth-distributing rollers 54, and the spiral directions of the plurality of spiral parting grooves 541 on the two cloth-distributing rollers 54 are consistent, and the two ends of the plurality of cloth-distributing rollers 54 are respectively rotatably connected to the lower ends of the plurality of cloth-distributing brackets 53, and the two ends of the plurality of cloth-distributing rollers 54 are respectively coaxially connected to linkage gears 55, and the plurality of linkage gears 55 are mutually The intermittent drive mechanism 56 is provided at one end of one of the fabric parting rollers 54. The intermittent drive mechanism 56 includes a drive motor 561. The drive motor 561 is arranged on one side of the lower part of the fabric support 53. The output end of the drive motor 561 is coaxially connected to an active dial 562. The active dial 562 is interlocked and connected to a groove wheel 563. The number of radial grooves on the connecting groove wheel 563 is equal to the number of spiral parting grooves 541 provided on a single fabric parting roller 54. The groove wheel 563 is coaxially connected to one end of one of the fabric parting rollers 54. The intermittent drive mechanism 56 is arranged at one of the On the lower side of the material distribution bracket 53, the reinforcement material bin 51 conveys the reinforcement material to the multiple material distribution units 52 through a hose. The reinforcement material is divided into equidistant strips by the multiple spiral parting grooves 541 on the material distribution parting roller 54, and then flows out from the discharge trough 524, and is laid on the bonding layer 1 and the gravel layer 2; one of the material distribution parting rollers 54 is driven to rotate by the intermittent driving mechanism 56, thereby changing the position where the reinforcement material flows out of the discharge trough 524, and then the two material distribution parting rollers 54 are driven to rotate in the opposite direction through the engagement of multiple linkage gears 55, and the reinforcement materials in opposite directions flow out of the discharge trough 524, and overlap to form a honeycomb-shaped mesh reinforcement layer 3.

[0044] Operation principle: Firstly, the surface of the semi-rigid base or cement concrete pavement 4 is roughened and purified; then the bonding layer 1 and the crushed stone layer 2 are spread synchronously by an engineering vehicle; then the crushed stone layer 2 is rolled once by a tire roller to position the crushed stone layer 2; the distance between the roller and the engineering vehicle in step S2 is no more than 5m; at the same time, the reinforcement layer 3 is laid by the reinforcement laying mechanism 5 installed at the rear of the roller; wherein the reinforcement silo 51 conveys the reinforcement material to the multiple material distribution units 52 through a hose, and the reinforcement material passes through the multiple spiral parting grooves on the material distribution parting roller 54 After being divided into equidistant strips, 541 flows out from the discharge trough 524 and is laid on the bonding layer 1 and the crushed stone layer 2; one of the material distribution parting rollers 54 is driven to rotate by the intermittent drive mechanism 56, thereby changing the position where the reinforcement material flows out of the discharge trough 524, and then the two material distribution parting rollers 54 are driven to rotate in the opposite direction through the engagement of multiple linkage gears 55, and the reinforcement material flows out of the discharge trough 524 in the opposite direction, and after overlapping, a honeycomb-shaped mesh reinforcement layer 3 is formed; finally, after the temperature of the bonding layer 1 and the reinforcement layer 3 drops, the traffic is opened to the construction vehicles, and the asphalt surface layer 6 is laid.

[0045] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for preparing an asphalt stress absorbing layer for delaying cement reflective cracks, characterized in that: The asphalt stress absorption layer for delaying cement reflective cracks comprises an adhesive layer (1), a crushed stone layer (2) is embedded in the adhesive layer (1), and a reinforcement layer (3) is provided on the top surface of the adhesive layer (1); The bonding layer (1) is a mixture of rubber asphalt, diluent, fiber material, and concrete interface adhesive; The crushed stone layer (2) is a single-size crushed stone pre-coated with asphalt, and its coverage rate is 50-60%; The reinforcement layer (3) is arranged in a honeycomb mesh shape, and its height is 1.5-2 times the single particle diameter of the crushed stone layer (2), and its material is rubber asphalt; The reinforcement layer (3) and the bonding layer (1) are mutually fused and have no obvious boundary. The method for preparing the asphalt stress absorbing layer for delaying cement reflective cracks comprises the following steps: S1. Base treatment: roughening and cleaning the surface of the semi-rigid base (4); S2. Synchronous spreading: Spreading the adhesive layer (1) and the gravel layer (2) synchronously by an engineering vehicle; S3. Rubber wheel rolling: rolling with a tire roller once to position the gravel layer (2); the distance between the roller and the engineering vehicle in step S2 is no more than 5m; S4. Laying reinforcement: installing a reinforcement laying mechanism (5) at the rear of the roller in step S3, and laying the reinforcement layer (3) through the reinforcement laying mechanism (5); S5. Health maintenance: After the temperature of the bonding layer (1) and the reinforcement layer (3) drops, the traffic is opened to construction vehicles and the asphalt surface layer (6) is laid; The reinforced laying mechanism (5) comprises a reinforced material bin (51), the reinforced material bin (51) being arranged at the rear of the road roller, the output end of the reinforced material bin (51) being connected to a plurality of material distribution units (52) via a hose, material distribution brackets (53) being symmetrically arranged at both ends of the plurality of material distribution units (52), the upper ends of the plurality of material distribution brackets (53) being arranged at the bottom of the reinforced material bin (51), material distribution parting rollers (54) being arranged inside the plurality of material distribution units (52), the two ends of the plurality of material distribution parting rollers (54) being rotatably connected to the lower ends of the plurality of material distribution brackets (53), the two ends of the plurality of material distribution parting rollers (54) being coaxially connected to linkage gears (55), the plurality of linkage gears (55) being meshed with each other, one end of one of the material distribution parting rollers (54) being provided with an intermittent driving mechanism (56), the intermittent driving mechanism (56) being arranged on one side of the lower part of one of the material distribution brackets (53).

2. The method for preparing an asphalt stress absorbing layer for delaying cement reflective cracks according to claim 1, characterized in that: The material distribution unit (52) includes a material collecting main pipe (521), the middle part of which is connected to the output end of the reinforced silo (51) via the hose, a plurality of material distribution branch pipes (522) are provided at the lower part of the material collecting main pipe (521), the lower ends of the plurality of material distribution branch pipes (522) are all provided at the upper part of a material distribution cylinder (523), the material distribution cylinder (523) is provided with a material parting roller (54), and a material discharge trough (524) is provided at the lower part of the material distribution cylinder (523).

3. The method for preparing an asphalt stress absorbing layer for delaying cement reflective cracks according to claim 2, characterized in that: A plurality of spiral parting grooves (541) are formed on the outer side of the cloth parting roller (54).

4. The method for preparing an asphalt stress absorbing layer for delaying cement reflective cracks according to claim 1, characterized in that: The intermittent drive mechanism (56) comprises a drive motor (561), the drive motor (561) is arranged on one side of the lower part of the cloth support (53), the output end of the drive motor (561) is coaxially connected to an active dial (562), the active dial (562) is engaged with a groove wheel (563), and the groove wheel (563) is coaxially connected to one end of one of the cloth parting rollers (54).

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