CN114808596A

CN114808596A - Double-layer drainage travel road and laying method thereof

Info

Publication number: CN114808596A
Application number: CN202210522408.XA
Authority: CN
Inventors: 季正军; 张文虎; 杨永富; 席鹏辉; 王光勇; 高培成; 孙岳; 秦庆阳
Original assignee: Shandong Transportation Institute; Shandong Luqiao Group Co Ltd
Current assignee: Shandong Transportation Institute; Shandong Luqiao Group Co Ltd
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2022-07-29
Anticipated expiration: 2042-05-13
Also published as: CN114808596B

Abstract

The invention belongs to the technical field of road traffic, and particularly relates to a double-layer drainage tourist road and a paving method thereof. The drainage pavement structure of the tourist highway comprises a cement stabilized macadam base layer, a water sealing layer, a large-pore drainage layer, a water permeable bonding layer and a surface antiskid drainage layer from bottom to top in sequence; the porosity of the large-pore drainage layer is 14-28%; the surface antiskid drainage layer has a void ratio of 11-23%; the permeable bonding layer comprises modified emulsified asphalt and basalt fibers uniformly distributed in the modified emulsified asphalt. The tourism highway adopts a double-layer drainage structure with larger void ratio and different widths, and can realize quick drainage by matching with a single-particle-diameter gravel drainage structure at the edge part; the permeable bonding layer solves the problem of poor bonding between drainage structure layers, the large porosity of the drainage layer and the use of basalt fibers in the permeable bonding layer can also relieve the reflection problem of asphalt pavement cracking, optimize the full life cycle of the asphalt pavement and improve the economic and social benefits.

Description

Double-layer drainage travel road and laying method thereof

Technical Field

The invention belongs to the technical field of road construction, and particularly relates to a double-layer drainage travel road and a laying method thereof.

Background

With the rapid development of Chinese economy, the material culture living standard of people is gradually improved, and tourism becomes an important demand and choice for people to relax and vacate. At present, the research on tourism and traffic in China just starts, and as tourism roads are often arranged in areas with complex natural landscape and surrounding mountains and water, the areas have the characteristics of heavy rain and large longitudinal slopes, and have the outstanding problems of poor drainage effect, poor interlayer adhesion and the like. Therefore, the development of the travel highway asphalt pavement which can smoothly drain water and has excellent interlayer bonding performance is particularly urgent. Chinese patent CN205711602U (application No. 201620250079.8) discloses an asphalt pavement structure with double-layer drainage and noise reduction, which comprises, from top to bottom, an upper drainage and noise reduction asphalt layer, a high-strength permeable connecting layer, a middle drainage and noise reduction asphalt layer, a waterproof bonding layer, and a lower dense-graded asphalt concrete layer in sequence. However, the material of the high-strength permeable connection layer in the patent is one of thermally modified asphalt, aqueous epoxy resin modified emulsified asphalt, aqueous polyurethane modified emulsified asphalt or rubber asphalt, and these asphalt cannot provide the required shear strength between the upper surface layer and the middle surface layer, so that the adhesive layer is easily damaged, and the road surface is damaged, so that the traffic is blocked.

The invention adopts a double-layer large-pore drainage type asphalt pavement structure, matches with a single-grain-diameter gravel road shoulder and a transverse drainage facility at the edge part, and realizes the quick and effective drainage of the accumulated water on the pavement through the differentiated arrangement of different drainage layer widths; meanwhile, the invention aims to develop a novel permeable bonding layer, solves the problem of poor bonding between the double-layer drainage structure layers of the traditional asphalt pavement, ensures drainage smoothness and simultaneously improves the structural strength of the pavement.

Disclosure of Invention

Aiming at the problems of poor drainage effect, poor adhesion between drainage structure layers and the like of the tourism road in the prior art, the invention provides the tourism road with good double-layer drainage and interlayer adhesion and the paving method thereof, which can effectively realize quick drainage of the road surface, improve the driving safety, ensure the interlayer adhesion and achieve the purpose of prolonging the service life of the road.

In order to achieve the purpose, the invention adopts the following technical scheme:

a double-layer drainage tourist highway is characterized in that the tourist highway is laid on a roadbed and comprises a drainage pavement structure and edge drainage structures arranged on two sides of the drainage pavement structure;

the drainage pavement structure sequentially comprises a cement stabilized macadam base layer, a water sealing layer, a large-pore drainage layer, a permeable bonding layer and a surface antiskid drainage layer from bottom to top;

the thickness of the macroporous drainage layer is 5-8 cm, the porosity is 14-28%, a macroporous drainage type asphalt mixture is adopted, limestone is selected as aggregate, SBS modified asphalt is selected as asphalt, and the using amount of the asphalt is 3.0-3.3%; preferably, the porosity is 24-27%;

the thickness of the surface anti-skid drainage layer is 4-5 cm, the porosity is 11-23%, an asphalt mixture with drainage and surface anti-skid functions is adopted, basalt is selected as aggregate, lime powder is selected as filler, SBS modified asphalt is selected, and the designed asphalt dosage is 3.4-3.7%; preferably, the porosity is 18-22%;

the permeable bonding layer comprises modified emulsified asphalt and basalt fibers uniformly distributed in the modified emulsified asphalt.

The connection between each asphalt structure layer of the asphalt pavement has great influence on the stress distribution of the pavement structure, and in order to meet the elastic layered continuous system theory of the asphalt pavement structure design, good interlayer bonding between each structure layer must be ensured. The double-layer drainage structure of the asphalt pavement is in a wet state for a long time in rainy seasons, and the problem of poor interlayer adhesion exists. The shear strength can reflect the quality of the interlayer bonding performance of the asphalt pavement to a certain extent, the higher the shear strength is, the better the interlayer bonding performance is, the longer the service life of the highway is, and vice versa. On the premise of ensuring interlayer water permeability, the water permeable bonding layer can effectively improve the shear strength and interlayer bonding force of the double-layer drainage structure of the asphalt pavement.

Preferably, the spreading amount of the modified emulsified asphalt is 0.2-0.4 kg/m ² 。

Preferably, the spraying amount of the basalt fibers is 30-60 g/m ² 。

Preferably, the thickness of the cement-stabilized macadam foundation is 30-54 cm, and the compactness is 97-98%.

Preferably, the thickness of the water sealing layer is 0.8-1.4 cm, and the water sealing layer comprises SBS modified asphalt and macadam; more preferably, the spreading amount of the SBS modified asphalt is 1.2-1.5kg/m ² The particle size of the crushed stone is 5-10 mm, and the dosage of the crushed stone is 4-6kg/m ² 。

Preferably, the macroporous drainage gradation range is as follows:

coarse particle formula A: the passing rate range of a standard sieve pore of 31.5mm is 100 percent; the passing rate range of the standard sieve pore of 26.5mm is 65-90%; the passing rate range of the standard sieve pore with the diameter of 19mm is 45-82%; the 16mm passing rate range of the standard sieve pore is 35-70%; the passing rate range of a standard sieve pore of 9.5mm is 18-38%; the passing rate range of 4.75mm standard sieve holes is 6-28%; the passing rate range of a standard sieve pore of 2.36mm is 5-16%; the passing rate range of the standard sieve pore of 0.3mm is 2-7%; the passing rate range of the standard sieve holes with 0.075mm is 1-5%.

Preferably, the surface anti-skid drainage layer grading range is as follows:

medium particle formula B: the 19mm passing rate range of the standard sieve pore is 100 percent; the 16mm passing rate range of the standard sieve pore is 90-100%; the passing rate range of a standard sieve pore of 9.5mm is 30-55%; the passing rate range of 4.75mm standard sieve holes is 7-26%; the passing rate range of a standard sieve pore of 2.36mm is 5-18%; the passing rate range of the standard sieve pore of 0.3mm is 3-10%; the passing rate range of the standard sieve holes with 0.075mm is 1-4%.

The double-layer drainage pavement structure has larger designed porosity, wherein the porosity of the large-pore drainage layer can reach 24-27%, so that the excellent water permeability of the pavement structure layer is ensured.

Preferably, the construction widths of the cement stabilized macadam base layer, the water sealing layer and the large-pore drainage layer are the same, and the construction widths of the water permeable bonding layer and the surface antiskid drainage layer are 10-28 cm smaller than the construction width of the large-pore drainage layer.

Preferably, in the non-ultrahigh straight section of the road, the construction widths of the permeable bonding layer and the surface antiskid drainage layer are 14-26 cm less than those of the large-pore drainage layer, and 7-13 cm less than those of the left side and the right side of the road respectively; in the ultrahigh section of the bend of the road, the construction widths of the water-permeable bonding layer and the surface antiskid drainage layer are only 12-24 cm less than that of the large-pore drainage layer on one side of the downhill foot of the ultrahigh section of the bend.

Preferably, the side part drainage structure comprises a road shoulder, a curb stone, a drainage pipe and a soil slope, wherein the road shoulder is formed by filling single-grain-diameter broken stones and is divided into a lower road shoulder and an upper road shoulder according to the filling sequence, and the lower road shoulder is arranged on the roadbed at two sides of the drainage road surface structure; the top surface of the anti-skid drainage layer is lower than the top surface of the surface anti-skid drainage layer and is provided with kerbstones, and cement mortar is paved between the lower road shoulder and the roadbed; soil side slopes are filled outside the kerbstones and the lower road shoulders; a single-grain-diameter broken stone is filled between the kerbstone and the surface antiskid drainage layer to form an upper road shoulder, and the height of the upper road shoulder is flush with the upper surface of the surface antiskid drainage layer; the drainage pipe is transversely arranged on the roadbed at two sides of the highway, one end of the drainage pipe extends into the bottom of the lower road shoulder by 2-8 cm, and the other end of the drainage pipe is arranged outside the soil slope.

Preferably, the thickness of the cement mortar is 2-4 cm, and the cement mortar is mainly used for separating water from a roadbed and preventing the roadbed from being soaked in water drainage.

Preferably, the particle size of the single-particle-diameter crushed stone is 5-10 cm or 10-15 cm.

Preferably, the end part of the drainage pipe extending into the road shoulder is wrapped by high-permeability geotextile.

Preferably, the drain pipe adopts the PVC pipe, and the pipe diameter is 6 ~ 10cm, and the horizontal slope is 3 ~ 8%, and the interval of two parallel arrangement's drainage is 5 ~ 10 m.

Preferably, the outer side face of the lower road shoulder and the top face of the lower road shoulder outside the kerb are both paved with anti-filtration geotextile.

Preferably, the cement-stabilized macadam base layer and the water seal layer are coated with emulsified asphalt for water prevention.

The invention also provides a paving method of the tourist road, which is characterized by comprising the following steps:

(1) building a roadbed, paving a cement-stabilized macadam base layer on the roadbed, maintaining for 7 days or more, constructing a water sealing layer on the cement-stabilized macadam base layer by adopting a synchronous macadam seal vehicle, and standing for 2-3 hours after construction is finished;

(2) paving a large-pore drainage layer, mixing an asphalt mixture of the large-pore drainage layer by using an intermittent asphalt mixing station, conveying the mixture to the site by using a transport vehicle, paving by using a paver, and finally compacting and sealing the road roller for transportation and health maintenance for 1 day;

(3) constructing a permeable bonding layer, cleaning the surface of a macroporous drainage layer by using an air blower, and then spraying modified emulsified asphalt and basalt fibers by using a synchronous construction vehicle, wherein the modified emulsified asphalt is sprayed in the front, the basalt fibers are sprayed in the back, and standing for 1-2 hours;

(4) paving a surface anti-skid drainage layer, similarly mixing by adopting an intermittent asphalt mixing station, conveying to the site by using a transport vehicle, paving by using a paver, and finally compacting by using a road roller and sealing for traffic health maintenance for 1 day.

(5) Brushing emulsified asphalt on the side surface of the cement stabilized macadam base, constructing cement mortar after the emulsified asphalt is demulsified, and preserving for 3-5 days after the construction is finished;

(6) placing a transverse drain pipe, wherein one end of the drain pipe is placed on cement mortar, the opening at the end part is wrapped by high-permeability geotextile, the other end of the drain pipe is arranged at a side slope or a torrent groove, and the bottom of the drain pipe is filled with plain soil and compacted;

(7) the method comprises the following steps of (1) supporting a template, constructing single-particle-size crushed stone on cement mortar to fill a lower road shoulder, filling 2-3 layers, compacting each layer by adopting a flat plate compactor, and enabling the top surface of the lower road shoulder to be lower than that of a surface anti-skid drainage layer;

(8) after the top surface of the single-particle-diameter crushed stone in the step (7) is compacted and leveled, installing a curb, placing the curb outside the construction width of the large-pore drainage layer, filling the gap between the curb and the drainage pavement structure with the single-particle-diameter crushed stone to construct an upper road shoulder, and filling until the top surface is flush with the top surface of the surface anti-skid drainage layer;

(9) after the road shoulder construction is finished and the template is removed, laying reverse filter geotextile outside the lower road shoulder;

(10) and filling soil outside the reverse filter geotextile to construct a soil slope.

And (4) compacting by adopting a road roller, wherein in the process, the basalt fibers can be uniformly distributed in the modified emulsified asphalt under the action of pressure to form a permeable bonding layer, and the interlayer bonding of the permeable bonding layer to the large-pore drainage layer and the surface antiskid drainage layer is further improved.

One or more technical schemes provided by the invention at least have the following technical effects:

(1) the drainage type asphalt pavement structure with double layers of large pores is adopted, the single-grain-diameter gravel road shoulder and the transverse drainage facility at the edge are matched, and meanwhile, the width of the surface anti-skid drainage layer is designed to be smaller than that of the large-pore drainage layer, so that accumulated water on the pavement can be quickly and effectively drained, the anti-skid property of the pavement surface in rainy days is improved, the driving safety is ensured to the maximum extent, and the driving accident risk is reduced.

(2) The novel framework-gap asphalt mixture grading form is adopted for the tourist highway, so that the using amount of coarse aggregates is increased to the maximum extent, the using amount of fine aggregates is reduced, the framework embedding extrusion and large void ratio of the mixture are realized, the structural strength is ensured, and meanwhile, the drainage smoothness is greatly improved.

(3) The novel permeable bonding layer researched and developed by the invention solves the problem of poor bonding between the double-layer drainage structure layers of the traditional asphalt pavement, and greatly improves the structural strength of the pavement while ensuring the drainage smoothness.

(4) The large porosity of the drainage layer and the use of basalt fibers in the permeable bonding layer effectively relieve the reflection problem of asphalt pavement cracking, optimize the whole life cycle of the asphalt pavement, and have remarkable economic and social benefits.

Drawings

FIG. 1 is a schematic view of the super high section of a double-layer drainage tourist highway of the present invention.

FIG. 2 is a schematic cross-sectional view of a non-super high section of a double-layer drainage tourist highway according to the present invention.

Wherein, 1, roadbed; 2. a cement stabilized macadam base; 3. sealing a water layer; 4. a macroporous drainage layer; 41. a water permeable adhesive layer; 5. a surface anti-skid drainage layer; 6. emulsified asphalt; 7. cement mortar; 8. a drain pipe; 901. a lower shoulder; 902. getting on a road shoulder; 10. a curb; 1101. reversely filtering the geotextile; 1102. reversely filtering the geotextile; 12. a soil slope.

Detailed Description

The following describes a double-layer drainage travel road and a paving method thereof in a specific embodiment mode with reference to the attached drawings of the specification.

The raw materials in the invention are derived from the following sources:

SBS modified asphalt, modified emulsified asphalt and emulsified asphalt: shandong high speed materials group, Inc.; limestone and single-particle-diameter crushed stone: denuding building materials ltd; basalt: jinan xing an stone Co., Ltd; lime powder: weishan county Kun Pengcai, Inc.; basalt fiber: tai anhaoda new materials limited.

Example 1

A travel road with excellent double-layer drainage and interlayer adhesion and a paving method thereof are disclosed, which comprises the following specific steps:

(1) building a roadbed 1, then paving a cement stabilized macadam base layer 2 on the roadbed 1, paving the cement stabilized macadam base layer 2 with the thickness of 36cm, maintaining for 7 days, paving a water sealing layer 3 with the same width on the cement stabilized macadam base layer 2, paving the cement stabilized macadam base layer with the thickness of 1.0cm, adopting a synchronous macadam sealing vehicle for construction, and spraying the SBS modified asphalt in a hot melting state with the spraying amount of 1.4kg/m ² 5kg/m of 5-10 mm single-grain-diameter crushed stone ² The crushed stones need to be dedusted by a mixing station;

(2) and paving a large-pore drainage layer 4.

The macroporous drainage layer asphalt mixture is mixed by an intermittent asphalt mixing station, a transport vehicle is conveyed to the site, a paver paves the mixture, and finally a road roller is compacted and the traffic is closed for 1 day. The paving thickness is 6cm, the construction width is consistent with that of a cement stabilized macadam base layer 2, limestone is selected as aggregate, coarse grain type A is selected as mixture grading, SBS modified asphalt is selected, the designed asphalt using amount is 3.0%, the designed porosity is 26%, the technical indexes of the large-pore drainage layer are shown in table 1, and the coarse grain type A mixture grading is shown in table 2.

TABLE 1 technical indices of macroporous drainage layers

TABLE 2 coarse grain type A mixture gradation of large pore drainage

(3) Construction of Water permeable adhesive layer 41

Before the construction of the permeable bonding layer 41, the surface of the large-pore drainage layer 4 is cleaned by an air blower, and then modified emulsified asphalt and basalt fiber are sprayed by a synchronous construction vehicle, wherein the technical indexes are shown in tables 3 and 4 respectively. Wherein the spraying amount of the modified emulsified asphalt is 0.3kg/m before the modified emulsified asphalt is sprayed ² Spraying basalt fiber at the back with the spraying amount of 50g/m ² Standing for 1-2 hours after construction is finished;

the construction width of the non-ultrahigh straight line section of the permeable bonding layer 41 is 24cm less than that of the large-pore drainage layer 4, the construction width of the ultrahigh section is 12cm less than that of the large-pore drainage layer, the construction width of the ultrahigh section is 20cm less than that of the large-pore drainage layer, and the construction width of the ultrahigh section is 20cm less than that of the downslope foot side only of the ultrahigh section;

TABLE 3 technical indices of modified emulsified asphalt

TABLE 4 basalt fiber technical index

(4) Anti-skid drainage layer for paved surface

Mixing by using an intermittent asphalt mixing station, conveying to the site by using a transport vehicle, paving by using a paver, and finally compacting by using a road roller and sealing traffic and maintaining for 1 day. The paving thickness is 4cm, the width is the same as that of the permeable bonding layer 41, the aggregate is basalt, the filler is lime powder, the mixture gradation is medium grain type B, the SBS modified asphalt is selected, the designed asphalt consumption is 3.4%, the designed void ratio is 20%, the technical indexes of the surface anti-skid drainage layer are shown in table 5, and the medium grain type B mixture gradation is shown in table 6.

TABLE 5 technical indexes of surface anti-skid drainage layer

TABLE 6 grading of the grain-type B mixture in the surface anti-skid drainage layer

(5) And the emulsified asphalt waterproof layer 6 is coated on the side surface of the cement stabilized macadam base layer 2.

(6) And after the emulsified asphalt 6 is demulsified, constructing cement mortar 7 with the thickness of 2cm and the width of 40cm, and curing for 3-5 days after the construction is finished.

(7) Placing a transverse drain pipe 8 which is a PVC pipe with the pipe diameter of 8cm and the transverse gradient of 5 percent at an interval of 5 meters; one end of the drain pipe is placed on the cement mortar 7 and is 5cm away from the outer edge, the opening of the end part is wrapped by high-permeability geotextile, the other end of the drain pipe is arranged at a side slope or a torrent tank, and the bottom of the drain pipe is filled with plain soil and compacted.

(8) And (3) supporting a template, constructing single-particle-size road shoulder broken stones to construct a lower road shoulder 901, wherein the particle sizes of the broken stones are 10-15 cm, the road shoulder broken stones are seated on cement mortar 7, the widths of the road shoulder broken stones are 40cm, the top surfaces of the road shoulder broken stones are lower than that of the third-layer surface anti-sliding drainage layer, the road shoulder broken stones are filled in 2-3 layers, and the road shoulder broken stones are compacted respectively by adopting a plate compactor.

(9) After the top surfaces of the road shoulder crushed stones are compacted and leveled, installing a kerbstone 10, wherein the kerbstone 10 is arranged outside the construction width of the large-pore drainage layer 4 and is 10cm away from the outer edge of the large-pore drainage layer; and (3) reserving a space between the road surface structure layers of the kerbstone 10, filling 10-15 cm of broken stones to construct an upper road shoulder 902, and filling the space until the top surface is flush with the top surface of the surface anti-skid drainage layer 5.

(10) And after the construction of the single-particle-diameter gravel road shoulder is finished and the templates are removed, the reverse filter geotextile 1101/1102 is laid on the gravel road shoulder top surfaces on the outer side of the single-particle-diameter gravel road shoulder and the outer side of the kerb 10.

(11) The soil slope 12 is constructed by filling soil.

Example 2

This example uses the same two-layer drainage asphalt pavement structure as in example 1, except that the basalt fiber spread amount was 40g/m ² 。

Example 3

Compared with the embodiment 1, the difference is that the thickness of the large-pore drainage layer 4 is 8cm, the porosity of the large-pore drainage layer 4 is 22%, the thickness of the surface anti-sliding drainage layer 5 is 5cm, the porosity of the surface anti-sliding drainage layer 5 is 15%, the mixture grading range of the large-pore drainage layer 4 is shown in the following table 7, and the mixture grading range of the surface anti-sliding drainage layer 5 is shown in the following table 8:

TABLE 7 mixture grading of macroporous drainage layers in example 3

TABLE 8 mixture gradation of surface anti-skid drainage layer in example 3

Comparative example 1

This comparative example employed the same two-layer drainage asphalt pavement structure as in example 1, except that the basalt fiber spread amount was 15g/m ² 。

Comparative example 2

This comparative example employed the same two-layer drainage asphalt pavement structure as in example 1, except that the basalt fiber spread amount was 75g/m ² 。

Comparative example 3

This comparative example employed the same two-layer drainage asphalt pavement structure as in example 1, except that no tie layer was provided between the large-pore drainage layer and the surface anti-skid drainage layer, as in example 1.

Comparative example 4

The comparative example uses the same two-layer drainage asphalt pavement structure as that of example 1, and is different from example 1 in that a conventional bonding layer is arranged between a large-pore drainage layer and a surface anti-skid drainage layer and only 0.6kg/m of bonding layer is sprayed ² The emulsified asphalt of (1).

Evaluation of test

Double-deck drainage road surface is in the humid state between the layer all the time at the drainage in-process throughout the year, and water can destroy the pitch membrane to weaken the adhesion of pitch and aggregate, influence bonding between the layer, can directly lead to peeling off between the layer of double-deck asphalt structure under the action of driving load, cause the road surface water to damage. Therefore, the interlaminar stress condition of the double-layer drainage asphalt pavement is simulated and evaluated through a direct shear test in a water saturation state, and the test conditions are as follows: the temperature is 25 ℃, the shearing rate is 50mm/min, and the water saturation time is 24 h; according to technical Specification for designing and constructing drainage asphalt pavement JTG/T3350-03-2020, an electronic water seepage instrument is used for testing the drainage performance (water seepage coefficient) of the pavement. Wherein 2 cross sections were taken for each of the examples and comparative examples, 3 test pieces were taken for each cross section, and the test results were averaged and shown in Table 9.

TABLE 9 direct shear test and automatic electronic type water seepage instrument test results

Note: the technical requirement of the water permeability coefficient is not less than 4500 mL/min.

The water seepage detection results show that the pavement water seepage coefficients of the three embodiments are far higher than the technical requirements of the drainage pavement, and the drainage effect is obviously superior to that of the existing drainage pavement. The road surface water permeability coefficient of the examples was slightly reduced compared to that of comparative example 3, indicating that the novel water-permeable adhesive layer 41 of the present invention has very little effect on the water permeability between the layers.

The test result of the direct shear test shows that the shear strength of the saturated water is as follows: example 1 ≈ example 2 ≈ example 3 > comparative example 4 > comparative example 3, and the interlayer shear strength of examples 1, 2, 3 is about twice as that of comparative examples 3, 4, indicating that the novel water permeable adhesive layer 41 of the present invention can play a very excellent interlayer adhesive effect in a drainage wet state, and the effect is significant compared to the conventional double-layer drainage structure.

The shear strength or the water permeability coefficient of the comparative example 1 and the comparative example 2 are reduced in different degrees, which shows that the control of the dosage of the basalt fiber in the water permeable bonding layer 41 is very critical, and only when the requirements of the invention on 30-60 g/m are met ² Under the premise of the distribution amount, the double technical effects of interlayer adhesion and drainage can be realized.

Compared with the comparative example 3, the shear strength of the conventional bonding layer adopted in the comparative example 4 is improved by nearly 50%, but the difference is still larger compared with the embodiment of the invention, and in addition, the drainage effect of the comparative example 4 cannot meet the technical requirement of a drainage pavement, which indicates that the conventional bonding layer is not beneficial to interlayer drainage.

From the above, the permeable adhesive layer 41 can solve the problem of poor adhesion between the two drainage structure layers of the conventional asphalt pavement. The large porosity of the drainage layer can counteract the expansion of cracks from a spatial angle; the basalt fiber can provide certain tension to prevent the development of cracks, and the basalt fiber can relieve the reflection problem of the cracks of the asphalt pavement under the combined action, optimize the full life cycle of the asphalt pavement, and improve economic and social benefits.

Claims

1. A double-layer drainage tourist highway is characterized in that the tourist highway is laid on a roadbed and comprises a drainage pavement structure and edge drainage structures arranged on two sides of the drainage pavement structure;

the thickness of the macroporous drainage layer is 5-8 cm, the porosity is 14-28%, a macroporous drainage type asphalt mixture is adopted, limestone is selected as aggregate, SBS modified asphalt is selected as asphalt, and the using amount of the asphalt is 3.0-3.3%;

the thickness of the surface anti-skid drainage layer is 4-5 cm, the porosity is 11-23%, an asphalt mixture with drainage and surface anti-skid functions is adopted, basalt is selected as aggregate, lime powder is selected as filler, SBS modified asphalt is selected, and the designed asphalt dosage is 3.4-3.7%; the permeable bonding layer comprises modified emulsified asphalt and basalt fibers uniformly distributed in the modified emulsified asphalt.

2. The tourist highway of claim 1, wherein the spreading amount of the modified emulsified asphalt is 0.2-0.4 kg/m ² Preferably, the spraying amount of the basalt fibers is 30-60 g/m ² 。

3. The travel road of claim 1, wherein the large pore drainage layer has a void content of 24-27% and the surface anti-slip drainage layer has a void content of 18-22%.

4. The tourist highway of claim 1, wherein the cement-stabilized macadam base layer has a thickness of 30-54 cm and a degree of compaction of 97-98%.

5. The tourist highway of claim 1, wherein the water seal layer is 0.8-1.4 cm thick and comprises SBS modified asphalt and macadam; preferably, the SBS modified asphalt spreading amount is 1.2-1.5kg/m ² The particle size of the crushed stone is 5-10 mm, and the dosage of the crushed stone is 4-6kg/m ² 。

6. The tourist highway of claim 1, wherein the large-pore drainage gradation ranges are as follows:

7. The tourist highway of claim 1, wherein the surface anti-skid drainage layer grading range is as follows:

8. The tourist highway of claim 1, wherein the cement stabilized macadam base layer, the water sealing layer and the large-pore drainage layer have the same construction width, and the construction width of the water permeable bonding layer and the surface anti-skid drainage layer is 10-28 cm smaller than that of the large-pore drainage layer; preferably, in the non-ultrahigh straight section of the road, the construction widths of the water-permeable bonding layer and the surface anti-skid drainage layer are 14-26 cm less than those of the large-pore drainage layer, and the construction widths of the water-permeable bonding layer and the surface anti-skid drainage layer are 7-13 cm less on the left side and the right side of the road respectively; in the ultrahigh section of the bend of the road, the construction widths of the water-permeable bonding layer and the surface antiskid drainage layer are only 12-24 cm less than that of the large-pore drainage layer on one side of the downhill foot of the ultrahigh section of the bend.

9. The tourist highway according to claim 1, wherein the edge drainage structure comprises a shoulder, a curb, a drainage pipe and a soil slope, wherein the shoulder is filled by single-grain-diameter crushed stones and is divided into a lower shoulder and an upper shoulder according to the filling sequence, and the lower shoulder is arranged on the roadbed at two sides of the drainage pavement structure; the top surface of the anti-skid drainage layer is lower than the top surface of the surface anti-skid drainage layer and is provided with kerbstones, and cement mortar is paved between the lower road shoulder and the roadbed; soil side slopes are filled outside the kerbstones and the lower road shoulders; a single-grain-diameter broken stone is filled between the kerbstone and the surface antiskid drainage layer to form an upper road shoulder, and the height of the upper road shoulder is flush with the upper surface of the surface antiskid drainage layer; the drainage pipe is transversely arranged on the roadbed at two sides of the highway, one end of the drainage pipe extends into the bottom of the lower road shoulder by 2-8 cm, and the other end of the drainage pipe is arranged outside the soil slope; preferably, the thickness of the cement mortar is 2-4 cm; preferably, the particle size of the single-particle-size crushed stone is 5-10 cm or 10-15 cm; preferably, the end part of the drainage pipe extending into the road shoulder is wrapped by high-permeability geotextile; preferably, the drain pipe is a PVC pipe, the pipe diameter is 6-10 cm, the transverse gradient is 3-8%, and the interval between two parallel drain pipes is 5-10 m; preferably, the outer side face of the lower road shoulder and the top face of the lower road shoulder outside the kerb are both paved with anti-filtration geotextile; preferably, the cement-stabilized macadam base layer and the water seal layer are coated with emulsified asphalt for water prevention.

10. The method for laying a tourist road according to any of claims 1-9, comprising the steps of:

(4) paving a surface anti-skid drainage layer, similarly stirring by adopting an intermittent asphalt mixing station, conveying to the site by using a transport vehicle, paving by using a paver, and finally compacting by using a road roller and sealing for traffic health maintenance for 1 day;