CN216891831U - Elastic thin-layer self-icebreaking pavement structure - Google Patents

Abstract

The utility model relates to the field of pavement structure design, and discloses an elastic thin-layer self-icebreaking pavement structure which comprises a pavement base layer, a pavement surface layer and a self-icebreaking surface layer, wherein the pavement surface layer consists of a first asphalt material layer, a second asphalt material layer and a third asphalt material layer, the first asphalt material layer and the second asphalt material layer are respectively formed by rolling a dense-graded asphalt concrete mixture, and the third asphalt material layer is formed by rolling an open-graded asphalt concrete mixture; and the self-icebreaking surface layer is paved on the third asphalt material layer through a bonding layer. The utility model effectively ensures the whole structure of the pavement surface layer by arranging the three-layer asphalt material layer structure with good mutual compatibility, and the graded asphalt upper surface layer is connected with the self-icebreaking surface layer through the strong bonding layer, thereby not only improving the stability of the combination of the asphalt upper surface layer and the self-icebreaking surface layer, but also being beneficial to removing ice water on the self-icebreaking surface layer of the pavement surface layer and avoiding secondary icing, thereby improving the self-icebreaking durability and solving the problem of poor cooperativity of the rubber self-icebreaking functional layer and the original pavement.

Description

Elastic thin-layer self-icebreaking pavement structure

Technical Field

The utility model belongs to the field of pavement structure design, and relates to an elastic thin-layer self-icebreaking pavement structure.

Background

Self-breaking ice roads are receiving much attention because of their many advantages. Compared with the traditional mechanical deicing method, salt spreading deicing and other methods, the self-icebreaking road surface is an active deicing road surface which changes the contact state of tires and the original road surface so that the vehicle-mounted vehicle and the road surface structure act together to realize the ice coating and breaking of the road surface. There are currently several major types of research self-icebreaking pavements: rubber particle asphalt pavement, rubber embedded pavement and rubber self-icebreaking functional layer. The rubber particle asphalt pavement is paved by replacing part of aggregates with rubber particles, and the pavement has a certain self-icebreaking effect but insufficient durability. Rubber inlay road surface is when road surface layer is built in the surface layer of impressing the rubber granule of certain shape size, perhaps at former road surface grooving, inlays into rubber strip, the road surface structure of building, and this kind of road surface icebreaking effect is more obvious, but will certainly destroy former road surface integrality, makes the road surface disease appear more easily. The rubber self-icebreaking functional layer is an elastic icebreaking layer which is paved on an original pavement by using graded rubber particles as aggregates and adopting a special bonding material to have a certain thickness, the pavement icebreaking effect is most obvious, but the functional layer and the original pavement are poor in cooperativity.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides an elastic thin layer self-icebreaking pavement structure to solve the problem of poor cooperativity between a rubber self-icebreaking functional layer and an original pavement.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides an elastic thin-layer self-icebreaking pavement structure which comprises a pavement base layer, a pavement surface layer and a self-icebreaking surface layer, wherein the pavement base layer, the pavement surface layer and the self-icebreaking surface layer are sequentially arranged from bottom to top; and the self-icebreaking surface layer is paved on the third asphalt material layer through the bonding layer.

By adopting the scheme, the vehicle runs on the self-icebreaking surface layer, the self-icebreaking surface layer is deformed by utilizing the vehicle load, the ice is broken, the self-icebreaking surface layer can be elastically restored, and after the ice is broken and melted, ice water permeates into the first graded asphalt material layer and is discharged to drainage ditches or side ditches at two sides of the road surface, so that the driving safety is ensured; and the supporting and open-graded first asphalt layer of the multilayer asphalt layer structure is connected with the self-icebreaking surface layer by adopting a soft material with higher bonding strength, so that the self-icebreaking surface layer is effectively prevented from being damaged by the travelling crane.

Further, the pavement base is a cement stabilized macadam base.

Furthermore, the first asphalt material layer is I type closely knit, and the second asphalt material layer is I type closely knit or II type semi-closely knit.

Further, the bonding layer is formed by spraying a modified epoxy resin adhesive.

Further, the self-icebreaking surface layer is formed by rolling and pressing rubber particle mixture.

Further, the particle size of the rubber particles is 0.18-3.35 mm.

Furthermore, the thickness of the first asphalt layer is larger than that of the second asphalt layer, the thickness of the second asphalt layer is larger than or equal to that of the third asphalt layer, and the thickness of the third asphalt layer is larger than that of the self-icebreaking surface layer.

Furthermore, the thickness of the first asphalt material layer is 18-30 mm, and the thickness of the second asphalt material layer and the third asphalt material layer is 12-20 mm.

Furthermore, the thickness of the self-icebreaking surface layer is 6-9 mm.

The utility model has the technical effects that: the elastic thin-layer self-icebreaking pavement structure not only effectively ensures the overall structure of the pavement surface layer, but also is beneficial to supporting the self-icebreaking surface layer with the elastic thin layer by arranging the three-layer asphalt material layer structure with good mutual compatibility; and the graded asphalt upper surface layer and the self-icebreaking surface layer are connected through the strong bonding layer, so that the combination stability of the asphalt upper surface layer and the self-icebreaking surface layer is improved, ice water on the self-icebreaking surface layer can be discharged from the pavement surface layer, secondary icing is avoided, the self-icebreaking durability is improved, and the problem that the synergy of the rubber self-icebreaking functional layer and the original pavement is poor is solved.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the utility model, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic cross-sectional view of a self-icebreaking pavement structure of an elastic thin layer according to the present invention;

FIG. 2 is a flow chart of the construction of the elastic thin layer self-icebreaking pavement structure of the present invention;

reference numerals: the pavement base layer 1, the first asphalt layer 2, the second asphalt layer 3, the third asphalt layer 4, the bonding layer 5 and the self-icebreaking surface layer 6.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

As shown in fig. 1, the present embodiment refers to an elastic thin layer self-icebreaking pavement structure, which includes a pavement base layer 1, a pavement surface layer and a self-icebreaking surface layer 6, which are arranged in sequence from bottom to top, wherein: the pavement base 1 is a cement stabilized macadam base, graded macadams are used as aggregates, gaps of the aggregates are filled by adopting a certain amount of cementing materials and enough mortar volume, and the pavement base is paved and compacted according to an embedding and extruding principle; the pavement surface layer consists of a first asphalt layer 2, a second asphalt layer 3 and a third asphalt layer 4 which are arranged from bottom to top in sequence, wherein the first asphalt layer 2 and the second asphalt layer 3 are both formed by rolling dense-graded asphalt concrete mixture, namely, the asphalt mixture is formed by mixing mineral aggregate and asphalt binder which are continuous in grain grading and are mutually embedded and extruded densely, and the residual void ratio after compaction is less than 10%; the third asphalt layer 3 is formed by rolling open-graded asphalt concrete mixture, namely, the open-graded asphalt mixture which is formed by embedding and extruding mineral aggregate mainly, has less fine aggregate and filler, separates mineral aggregates and has porosity of more than 18 percent after being compacted; the three asphalt surface layers are selected mainly by combining the characteristics of large vehicle flow, large vehicle load, low air temperature, easy icing, influence on driving arrangement and the like, wherein the lower surface layer selects a proper asphalt structure according to conditions such as high speed grade, thickness, climate and the like, the upper surface layer considers the characteristics of skid resistance and wear resistance, and the pavement surface layers are constructed for three times, so that the flatness of the pavement surface layers can be improved, and the driving comfort of the self-icebreaking pavement is improved; this from surface course 6 that opens ice then paves on third asphalt bed 4 through tie coat 5, from surface course 6 that opens ice rolls by rubber granule mixture and forms, the tie coat is formed by the spraying of modified epoxy adhesive, once only construct can, the construction is simple and convenient, especially choose for use two ingredient modified epoxy adhesive, better adhesive strength and chemical resistance can have, and cooperate the pitch surface course with from the bonding that the surface course that opens ice can be fine, improve from surface course intensity and durability that opens ice, simultaneously, choose for use to open the level to join in marriage the pitch surface course and can solve the icy water from the surface course that opens ice and join in marriage the road surface and discharge, avoid from the secondary on the surface course that opens ice to freeze.

When the self-icebreaking asphalt is used, a vehicle runs on the self-icebreaking surface layer, the self-icebreaking surface layer is deformed by utilizing vehicle load, the ice is broken, the self-icebreaking surface layer can be elastically restored, and after the ice is broken and melted, ice water permeates into the first graded asphalt layer and is discharged to drainage ditches or side ditches at two sides of the road surface, so that the driving safety is ensured; and the supporting and open-graded first asphalt layer of the multilayer asphalt layer structure is connected with the self-icebreaking surface layer by adopting a soft material with higher bonding strength, so that the self-icebreaking surface layer is effectively prevented from being damaged by a travelling crane, the strength and durability of the self-icebreaking surface layer are improved, and the cooperativity of the rubber self-icebreaking functional layer and the original pavement is improved.

In this embodiment the first bituminous layer is type i compacted, i.e. a residual porosity of 3% to 6% after compaction, and the second bituminous layer is type ii semi-compacted, i.e. a residual porosity of 4% to 10% after compaction. In a different embodiment, the second bituminous layer can, of course, also be densified with type i with the same structure as the first bituminous layer.

The rubber particle mixture of the self-icebreaking surface layer 6 in the embodiment also relates to a mixture of two-component polyurethane binder, quartz powder filler and rubber particles in proportion, and the particle size of the rubber particles is 0.18-3.35 mm, that is, the rubber particles in the rubber particle mixture adopt different particle sizes, which can be seen in the following table 1:

table 1: rubber particle grading table

The thickness of first bituminous layer 2 is greater than that of second bituminous layer 3, while the thickness of second bituminous layer 3 is greater than or equal to that of third bituminous layer 4, while the thickness of third bituminous layer 4 is greater than that of self-icing skin 6. Specifically, the thickness of the first asphalt layer is 25mm, the thickness of the second asphalt layer and the thickness of the third asphalt layer are both 20mm, and the thickness of the self-icebreaking surface layer is 9mm, so that the self-icebreaking surface layer with the elastic thin-layer structure can be formed on the pavement surface layer.

Referring to fig. 2 again, the construction method of the elastic thin layer self-icebreaking pavement structure is described in detail, which comprises the following steps:

s1, construction preparation: the method comprises the steps of processing the road surface of a construction section and processing construction tools, specifically, carrying out leveling treatment on a road surface base layer, cleaning a mixer, a stirring tool and a flat transport vehicle before construction, smearing an isolating agent, and leveling a weighing tool to ensure the weighing accuracy before adding each component, wherein all the construction tools can be put into use after being checked and accepted to meet requirements;

s2, multilayer asphalt construction: mixing and rolling three asphalt surface layers by adopting asphalt concrete mixtures with different grades, comprehensively checking the asphalt surface layers, detecting whether appearance and quality problems exist, repairing cracks existing in the pavement surface layers, removing a pavement asphalt oil film by adopting a pavement polisher, and blowing away pavement residues and floating dust by using a powerful blower to ensure that the pavement is dry and clean; protecting the edge of a construction area by using a plastic film and a transparent adhesive tape, adopting a fence for protection, and carrying out traffic control to prevent pollution;

s3, bonding layer spraying construction: firstly, preparing each component of the modified epoxy resin adhesive material according to a proportion, weighing a proper amount of adhesive according to the area size and the progress control of a spraying rolling area, and continuously spraying according to the width of paving equipment to ensure that the adhesive layer is required to fully wet a road surface but not flow; in the process of spraying the bonding material, the spraying speed of the bonding layer material needs to be determined according to the curing time of the material and the paving speed of the self-icebreaking surface layer, the parts of the self-icebreaking surface layer in paving contact are spraying areas, and the edge of the bonding layer is 2-3cm more than the edge of the self-icebreaking surface layer in paving.

S4, preparing a rubber particle mixture: adding rubber particles with different particle sizes into a mixer in proportion; weighing special double-component polyurethane according to a proportion, respectively pouring the special double-component polyurethane into a batching barrel, and stirring the special double-component polyurethane for 30 seconds at a low speed by using an electric drill; starting a mixer, stirring rubber particles for 15s to uniformly mix the rubber particles, pouring quartz powder and stirring for 10 s; adding the polyurethane cementing material into a stirrer, stirring for 15s, and stirring until the polyurethane cementing material is uniformly mixed, thereby completing the preparation of a rubber mixture; after the bonding layer is paved, the stirred rubber particle mixture is transported to the site through a flat transport vehicle and added into a paving machine for paving; wherein, the rubber particle mixture is firstly mixed in a trial way before formal mixing, the mixing time is determined, the quality of the mixture is checked, and if the quality does not meet the requirement, the adjustment is carried out; the uniformly mixed two-component polyurethane glue is required to be mixed and dispersed in rubber particles within 5min, so that concentrated heating is prevented;

s5, spreading and compacting the self-icebreaking surface layer: placing a rubber particle mixture at an initial position and adjusting the paving thickness for later use; after the rubber particle mixture is added into paver equipment, paving is started, the advancing speed is set, and the rubber particle mixture advances at a constant speed; leveling and compacting the paved rubber particle mixture by adopting a special small compacting machine, and brushing a release agent on the surface of equipment before use; in the compaction process, manual supplementary compaction or mixture filling and then compaction are carried out on the uneven area so as to ensure that the flatness of the self-icebreaking surface layer meets the requirement of driving comfort; wherein the thickness of the elastic thin layer is 9mm from the ice-breaking upper surface layer in a spreading and compacting way, and the virtual spreading thickness is 14 mm; detecting the flatness at any time by adopting a 3m ruler in the compaction process, and performing supplementary compaction on the uneven area or filling and compacting rubber mixture when the line flatness difference exceeds 3 mm; after the rubber particle mixture is paved, the paved appearance needs to be detected, so that the uniform pavement thickness, the proper cross slope and the smooth surface are ensured.

S6, maintenance and inspection: after the self-icebreaking surface layer is paved and compacted, seams can be generated among the multiple layers after the multiple layers of surface layers are constructed, and the seams are weak links in a structural system and need to be treated to a certain extent; when the mixture is not solidified, a hand-held ironing machine can be adopted to iron the joint, eliminate the hot joint and flatten the joint in time; when the mixture is solidified, the mixed polyurethane glue and a small amount of graded rubber particles are required to be adopted for filling, cold joints are eliminated, and the mixture is pressed flatly in time. After the elastic thin layer is paved, whether the foaming phenomenon occurs or not needs to be continuously checked within one day; when the bubbles are found, a spatula is used for breaking the bubbles immediately, so that the volatile gas in the reaction is released, and the supplement and compaction are carried out; continuously observing for two days to naturally maintain the thin layer, so that the strength of the cementing material can reach the maximum, and the enclosure can be removed to open the traffic; in the maintenance process, the paving strength needs to be monitored, the detection intervals are 24h, 18h, 12h and 12h, and the detection indexes are tensile strength and tear strength; after the traffic is opened, the pavement is tracked and monitored, and the main monitoring contents are pavement surface diseases, surface skid resistance, wear resistance and intensity change trend after the traffic is opened; the pavement ice breaking performance needs to be detected in winter so as to ensure the use effect of the self-icebreaking pavement.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (9)

1. An elastic thin-layer self-icebreaking pavement structure comprises a pavement base layer (1), a pavement surface layer and a self-icebreaking surface layer (6) which are sequentially arranged from bottom to top, and is characterized in that the pavement surface layer consists of a first asphalt material layer (2), a second asphalt material layer (3) and a third asphalt material layer (4) which are sequentially arranged from bottom to top, wherein the first asphalt material layer and the second asphalt material layer are formed by rolling dense-graded asphalt concrete mixture, and the third asphalt material layer is formed by rolling open-graded asphalt concrete mixture; and the self-icebreaking surface layer is paved on the third asphalt material layer through a bonding layer (5).

2. The thin resilient layer self-breaking ice pavement structure of claim 1, wherein the subgrade is a cement stabilized macadam.

3. The thin elastic layer self-icebreaking pavement structure according to claim 1, wherein the first asphalt layer is type i dense, and the second asphalt layer is type i dense or type ii semi-dense.

4. The thin elastic layer self-icebreaking pavement structure according to claim 1, wherein the bonding layer is formed by spraying modified epoxy resin adhesive.

5. The thin elastic layer self-icebreaking pavement structure according to claim 1, wherein the self-icebreaking surface layer is formed by rolling a rubber particle mixture.

6. The self-icebreaking pavement structure of claim 5, wherein the rubber particles have a particle size of 0.18-3.35 mm.

7. The thin elastic layer self-icebreaking pavement structure according to claim 1, characterized in that the thickness of the first asphalt layer is greater than that of the second asphalt layer, the thickness of the second asphalt layer is greater than or equal to that of the third asphalt layer, and the thickness of the third asphalt layer is greater than that of the self-icebreaking surface layer.

8. The thin elastic layer self-icebreaking pavement structure according to claim 7, wherein the thickness of the first asphalt layer is 18-30 mm, and the thickness of the second asphalt layer and the third asphalt layer is 12-20 mm.

9. The thin elastic layer self-icebreaking pavement structure according to claim 1, wherein the thickness of the self-icebreaking surface layer is 6-9 mm.

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