CN212477303U - Thin layer cover surface structure - Google Patents

Abstract

The utility model provides a thin-layer cover structure, which comprises a thermal regeneration thin-layer cover arranged on the original pavement structure layer, and the key point of the utility model is that viscous layer oil is arranged between the original pavement structure layer and the thermal regeneration thin-layer cover, and the viscous layer oil bonds the thermal regeneration thin-layer cover on the original pavement structure layer; the thermal regeneration thin layer overlay grading is SMA-10, and the thickness is 18-22 mm. The thin-layer cover has reasonable structure and excellent comprehensive performance.

Description

Thin layer cover surface structure

Technical Field

The utility model relates to a bituminous paving protective structure, more specifically say, especially relate to a thin layer top facing structure.

Background

In the service process of the existing asphalt pavement, the existing asphalt pavement is inevitably influenced by various environmental factors due to long-term exposure to natural conditions, and meanwhile, under the action of traffic load increased year by year, various diseases such as tracks, cracks, hugs, pits and the like are easily generated on the pavement structure, so that the service performance of the pavement is seriously influenced. Therefore, in order to prolong the service life of the pavement, various maintenance measures are usually adopted to treat the pavement, wherein the thin-layer overlay is used as a common preventive maintenance technology and achieves good effects in actual road engineering in China.

The existing thin-layer overlay is formed by additionally laying a layer of hot-mix asphalt mixture with the thickness not more than 25mm on the original pavement, so that a brand-new surface is provided for the asphalt pavement, the flatness of the original pavement is increased, the driving comfort of the original pavement is improved, various diseases of the original pavement are repaired to a certain extent, and the improvement of the high-temperature performance, the skid resistance and the durability of the pavement is facilitated. At present, the thin-layer overlay technology mainly comprises an AC thin-layer overlay, an SMA thin-layer overlay, a SAC thin-layer overlay, a rubber powder modified asphalt concrete thin-layer overlay and the like.

Thin overlay, while an effective pavement maintenance technique, does not play a major load bearing role in the pavement structure and therefore, the thin overlay itself also requires further maintenance. At present, the maintenance mode of the thin-layer top coat mainly comprises the steps of additionally laying a new top coat on the original top coat, or carrying out maintenance by milling and re-laying. However, the repair and maintenance of the thin overlay also have certain problems, and the original thin overlay exists in the overlay structure in the form of an interlayer due to the laying structure of the thin overlay, which adversely affects the stability of the original pavement structure and easily causes the pavement to be damaged again. The milling and re-paving mode causes environmental pollution to the produced waste asphalt mixture and influences the road environment. Therefore, in recent years, researchers add a mineral regenerant to the waste asphalt mixture to recover the performance of the waste asphalt mixture, and reuse the waste asphalt mixture in a new thin-layer overlay.

At present, the performance of the waste asphalt mixture can be recovered to a certain extent by adding the mineral oil regenerant, and meanwhile, the road construction waste is effectively treated, so that the sustainable development of road engineering is promoted. However, because the traditional mineral oil has strong carcinogenicity, higher price and poorer ageing resistance, further exploration and improvement are needed to obtain a thin-layer cover surface structure with more reasonable structure and good comprehensive performance.

SUMMERY OF THE UTILITY MODEL

The to-be-solved problem of the utility model is to the above-mentioned not enough and provide a thin layer top facing structure that exists among the prior art, solved among the prior art thin layer top facing structure unreasonable, the poor problem of comprehensive properties.

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

the utility model provides a thin layer mat face structure, including locating the thin layer mat face of heat regeneration on the former road surface structural layer, the key of the utility model lies in being equipped with the viscous coat oil between former road surface structural layer and heat regeneration thin layer mat face, the viscous coat oil bonds the thin layer mat face of heat regeneration on former road surface structural layer; the thermal regeneration thin layer overlay grading is SMA-10, and the thickness is 18-22 mm.

Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses require to adopt vegetable oil regenerant when preparing thermal regeneration thin layer top facing, through the joining of adhesive coat oil, the old thin layer top facing of clearing up during the regeneration maintenance, green, economy is suitable for, can effectively resume each item index of ageing pitch in the old and useless bituminous mixture, thereby guarantee the performance of regeneration thin layer top facing, simultaneously according to SMA-10 concrete gradation, 18-22 mm's thickness paves, construction workability is better, intensity can satisfy the performance requirement as the thin layer top facing structure of road surface maintenance layer, can realize reduce cost again, energy saving and environmental protection, while effective handling building rubbish, the comprehensive properties is excellent.

Additional advantages, objects, and features of the invention 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 invention.

Drawings

Fig. 1 is a schematic structural diagram of one embodiment of the present invention;

FIG. 2 is a partial top view of a steel wire grid;

fig. 3 is a sectional view taken along line a-a of fig. 2.

The pavement structure comprises an original pavement structure layer 1, adhesive layer oil 2, a thermal regeneration thin layer overlay 3, a steel wire grid 4, longitudinal and transverse steel wires 401 and connecting ribs 402.

Detailed Description

In order to make the utility model realize that technical means, creation characteristics, achievement purpose and effect are clearer and easily understand, it is right to combine below the figure and the detailed implementation mode the utility model discloses do further explanation:

as shown in fig. 1, this embodiment shows a thin-layer overlay structure, which includes a thermal regeneration thin-layer overlay disposed on the original pavement structure layer, and the thermal regeneration thin-layer overlay is similar to the existing thermal regeneration thin-layer overlay, and is also made of waste asphalt mixture recovered from the old thin-layer overlay in the maintenance process, that is, by adding a regenerant, new asphalt, and new aggregate to mix and pave again, but the regenerant in this embodiment is vegetable oil regenerant. Meanwhile, in the embodiment, adhesive oil is arranged between the original pavement structure layer and the thermal regeneration thin-layer overlay, the thermal regeneration thin-layer overlay is bonded on the original pavement structure layer by the adhesive oil, the specific grading of the thermal regeneration thin-layer overlay is SMA-10, and the paving thickness is 18-22 mm. In the embodiment, on the basis of SMA-10 gradation and 18-22mm thickness, the waste asphalt mixture in the original damaged thin-layer overlay is regenerated by adopting the green environment-friendly and low-cost vegetable oil regenerant, and then rolled and paved into a new thin-layer overlay again, so that not only are road building materials saved, but also the waste asphalt mixture is effectively treated. In addition, the vegetable oil regenerant has more advantages in the aspects of cost, environmental protection and service performance compared with the traditional mineral oil regenerant, and by adopting the vegetable oil regenerant, various indexes of aged asphalt in waste asphalt mixtures can be effectively recovered, so that the service performance of the regenerated thin-layer overlay is ensured. Compare and adopt traditional mineral oil regenerant to regenerate old and useless bituminous mixture to carry out the maintenance of thin layer top facing, after the above-mentioned gradation of vegetable oil regenerant collocation and the thickness of paving in this embodiment, all have the advantage in the aspect of feature of environmental protection, price and ageing resistance, its viscosity reduction effect is more excellent simultaneously, and construction workability is better, and energy resource consumption is lower, can be fine compensate the not enough of traditional mineral oil regenerant. Therefore, the thermal regeneration thin-layer cover surface structure used in the embodiment can reduce cost, save energy and protect environment, effectively treat building garbage and has excellent comprehensive performance.

On the basis of the above embodiment, better cohesiveness can be obtained by preferably selecting the layer-sticking oil as SBS modified emulsified asphalt. In addition, should lay the steel wire grid along the route direction in the viscous layer oil, as shown in fig. 2, the steel wire grid's the steel wire intersection of moving about freely and quickly is connected with the joint muscle uniformly style, can adopt welding or ligature connection as an organic whole between joint muscle and the steel wire of moving about freely and quickly, joint muscle length direction sets up along road surface thickness direction, and joint muscle length must satisfy its both ends and stretch into respectively in former road surface structural layer and the thin layer cover of heat regeneration, and its one end of stretching into the thin layer cover of heat regeneration is the domes that the bending down formed as shown in fig. 3, and the height H of hunch-up is no longer than 5mm to promote concrete and grab solid power and avoid the puncture harm when the road surface that probably exists under the extreme condition is extruded. Above design can make the thin layer top facing of thermal regeneration cover more firmly and cover on original road surface structure, and the wholeness is better, bears more, has especially prevented to shift between new and old structural layer, has guaranteed the stable durability of road. Further, in order to optimize the effect, during specific construction, the lengths of the two ends of the connecting ribs correspondingly extending into the original pavement structure layer and the thermal regeneration thin layer cover are 17-20mm, H is 2-3mm, and the nominal diameter of the connecting ribs is 2-3 mm.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims (4)

1. The utility model provides a thin layer mat facing structure, is including locating the thermal regeneration thin layer mat facing on former road surface structural layer which characterized in that: a bonding oil is arranged between the original pavement structure layer and the thermal regeneration thin-layer overlay, and the thermal regeneration thin-layer overlay is bonded on the original pavement structure layer by the bonding oil; the grading of the thermal regeneration thin layer cover is SMA-10, and the thickness is 18-22 mm.

2. The thin-layer overlay structure of claim 1 wherein: the adhesive layer oil is SBS modified emulsified asphalt.

3. The thin-layer overlay structure of claim 2 wherein: the bonding layer oil is internally laid with a steel wire grating along the path direction, the intersection of longitudinal steel wires and transverse steel wires of the steel wire grating is uniformly connected with a connecting rib in a body mode, the length direction of the connecting rib is arranged along the thickness direction of the pavement, the length of the connecting rib needs to meet the condition that two ends of the connecting rib respectively extend into the original pavement structure layer and the heat regeneration thin layer cover surface, one end of the connecting rib extending into the heat regeneration thin layer cover surface is of an arch structure formed by bending downwards, and the height of the arch is not more than 5 mm.

4. The thin-layer overlay structure of claim 3 wherein: the lengths of two ends of the connecting ribs correspondingly extending into the original pavement structure layer and the thermal regeneration thin layer cover are 17-20mm and 2-3mm in sequence, and the diameters of the connecting ribs are 2-3 mm.

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