CN109338841A - Unidirectional heat dissipation asphalt pavement structure and its construction method for Plateau Permafrost Areas - Google Patents
Unidirectional heat dissipation asphalt pavement structure and its construction method for Plateau Permafrost Areas Download PDFInfo
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- CN109338841A CN109338841A CN201811208256.6A CN201811208256A CN109338841A CN 109338841 A CN109338841 A CN 109338841A CN 201811208256 A CN201811208256 A CN 201811208256A CN 109338841 A CN109338841 A CN 109338841A
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- asphalt
- heat dissipation
- plenum chamber
- cutting optimal
- surface layer
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
- E01C7/325—Joining different layers, e.g. by adhesive layers; Intermediate layers, e.g. for the escape of water vapour, for spreading stresses
Abstract
The invention discloses a kind of unidirectional heat dissipation asphalt pavement structures for Plateau Permafrost Areas, including bituminous pavement and the plenum chamber for being distributed in inside asphalt pavement, wherein, the bituminous pavement is divided into superficial layer, middle surface layer and cutting optimal from top to bottom, the plenum chamber perforation setting is filled with conduction oil in middle surface layer and cutting optimal, the plenum chamber.The invention also discloses the construction methods of above structure.Structure of the invention makes blacktop have the function of thermal resistance conduction cooling; from source, reduction summer enters the heat in road surface; the heat in winter roadbed is accelerated to discharge outward; solve the problems, such as barrier of the bituminous pavement lower thermal conductivity to heat; and ensure that road surface heat dissipation is uniform; it solves the problems, such as that wide cut bituminous pavement heat absorption in Plateau Permafrost Areas is strong, conduction cooling is slow, heat dissipation is non-uniform, is of great significance to the highway construction for alleviating frozen soil thaw collapse, protection of permafrost and permafrost region.
Description
Technical field
The present invention relates to road constructions, more particularly to a kind of unidirectional heat dissipation asphalt pavement structure for Plateau Permafrost Areas
And its construction method.
Background technique
The whole world is similar to the area of Qinghai-Tibet Platean, is based on severe cold region, ecology fragility, especially with widely distributed more
Year frozen soil has broader subgrade and pavement so that road performance faces unprecedented challenge, especially highway, thicker
Asphalt surface course, in the environment of strong solar radiation and permafrost distribution, bituminous pavement heat absorption, heat build-up and heat accumulation effect are more
Significantly, more violent disturbance is caused to the ever-frozen ground that underlies, significantly improves the catagen speed of frozen soil, to the stabilization of highway engineering
Property proposes bigger challenge.
A series of current frozen earth roadbed stabilization techniques for being suitable for Qinghai-Tibet highway are suggested, including ventilating board+tile
Stone roadbed forces disperse formula ventilated embankment, and hot pin+XPS insulation board roadbed, unidirectionally radiate road surface+piece block-stone embankment etc..These
Technology belongs to simple combination on the basis of prior art: such as the cold season heat dissipation effect for strengthening piece block-stone embankment, at it
Ventilating board and unidirectional heat dissipation road surface are added in top；It is acted on to enhance the heat loss through convection of ventilation duct by forced convection；By setting
Hot pin is set, overcomes the problems, such as that the heat dissipation of XPS insulation board cold season is difficult.Generally speaking, these technologies are under the conditions of wide cut roadbed, actually
The effect of performance is limited.Above-mentioned technology all belongs to roadbed Treating technology in addition to unidirectionally heat dissipation road surface.And bituminous pavement is as jelly
The first barrier of soil and external environment heat exchange, related technology is seldom, such as leads by the way that addition diatomite, floating bead etc. are low
Hot material reduces heat and enters road surface, although warm season heat absorption can be effectively reduced, this also prevents dissipating for frozen earth roadbed cold season
Heat can only delay permafrost degradation speed.
In order to overcome the limitation and deficiency of the prior art, the present invention exists simultaneously the spy of heat transfer and mass transfer using liquid heat transfer
Point proposes a kind of unidirectional radiator structure for Plateau Permafrost Areas wide cut bituminous pavement, realizes that bituminous pavement summer hinders hot and cold
Season heat dissipation safeguards frozen earth stable to the frozen soil thaw collapse of high-speed broad-width roadbed.
Summary of the invention
Goal of the invention: in view of the above-mentioned problems existing in the prior art, this application provides one kind to have uniform, reduction of radiating
Permafrost region bituminous pavement heat absorption efficiency, the unidirectional heat dissipation pitch for improving bituminous pavement cold season radiating efficiency, safeguarding frozen earth stable
Pavement structure, and provide its construction method.
Technical solution: a kind of unidirectional heat dissipation asphalt pavement structure for Plateau Permafrost Areas of the present invention, including drip
Green road surface and the plenum chamber for being distributed in inside asphalt pavement, wherein the bituminous pavement is divided into superficial layer, middle surface layer from top to bottom
And cutting optimal, it is logical that the plenum chamber setting forms liquid heat transfer full of conduction oil in middle surface layer and cutting optimal, the plenum chamber
Road.
Liquid heat transfer channel is formed full of conduction oil in above-mentioned plenum chamber, is mainly based upon on mechanics, according to Pascal
Law, liquid can transmit the pressure suffered by it to all directions, and the pressure of all surface is identical, therefore relative to
The solid of same volume, under upper tire load action, when using liquid column, the average pressure of liquid column road pavement is smaller,
Namely load action is smaller, makes the more difficult destruction in road surface.If be not filled with completely, there will be air, the thermal conductivity of air is very
It is low, it will affect the heat-transfer effect in winter
The cavity chamber internal surface is equipped with sealant.
The sealant is nonrigid material, can be bitumen layer, polymer material, composite material etc..It is preferably logical
Smearing melting heated bitumen is crossed, forms bitumen layer after solidification.Pitch has preferable leakproofness；Pitch belongs to viscoelastic material, with
Rigid material ratio, pitch can deform at high temperature and dense contact is more readily formed in cavity surface (possible out-of-flatness), avoids
Gap；The contact interface of pitch and asphalt is stronger, and deformation performance is similar, is less likely to occur under load action point
From.
Preferably, the plenum chamber penetrates through vertically is arranged in middle surface layer and cutting optimal.
Since under normal circumstances, the bituminous pavement overall thickness is 10-20cm, wherein superficial layer 2-4cm, middle surface layer 2-
6cm, cutting optimal 6-10cm, surface layer and the plenum chamber height of cutting optimal are height 6-14cm in the vertical perforation.
The plenum chamber is preferably arranged to the cylinder of internal diameter 6-8mm, and the spacing between adjacent vacant chamber is 7.5-10cm.
The thermal conductivity of the conduction oil is 0.1-1.2W/mk lower than the thermal conductivity of asphalt used in road surfacing.
The thermally conductive oil nature is stablized, and does not react with pitch, and freezing point is lower than -40 DEG C, and viscosity is small, kinematic viscosity (40 DEG C) 16-
20mm2/s.The thermal conductivity of conduction oil is lower than asphalt used in road surfacing, because only existing in summer vertical liquid column
Conduction, is not present convection current, and the conduction oil of lower thermal conductivity can alleviate bituminous pavement heat absorption；Exist simultaneously in winter conduction and it is right
Stream, rapid heat dissipation, still, and cannot be too low, because if thermal conductivity is very low, it will affect winter heat dissipation.Further, according to upper
Diameter, depth and the distribution density for stating plenum chamber, the dosage for estimating conduction oil is 4.4kg/m3-15.4kg/m3。
The construction method of unidirectional heat dissipation asphalt pavement structure of the present invention for Plateau Permafrost Areas, including following step
It is rapid:
(1) asphalt mixture gradation: the gradation for the asphalt that cutting optimal and middle surface layer use is AC-20, upper layer
The gradation of the asphalt used is AC-16C；
(2) it cutting optimal and middle surface layer road surfacing: in the good base of making, is spread respectively using paver and road roller
Bituminous pavement cutting optimal and middle surface layer are built, for cutting optimal with a thickness of 6-10cm, middle surface thickness is 2-6cm；
(3) it arranges liquid heat transfer channel: laying cavity in the bituminous pavement being laid with using punch device, and in cavity
Sealant is arranged in the side of room and bottom surface, assembles conduction oil, finally using the upper surface of sealing material sealing cavity room floor；
(4) asphalt road surface: spraying sticking layer oil on the middle surface layer top of bituminous pavement, be laid with upper layer, thick
Degree is 2-4cm.
The specific mode of action of the invention is: with solid phase ratio, the heat transfer type of liquid is sent out in addition to there are also mass transfers for heat transfer
Raw convection current.In summer, the temperature of liquid column upper end is high, and the fluid density of upper end is low, and the temperature of liquid column lower end is low, the liquid of lower end
Volume density is high, therefore liquid cannot generate stronger convection current under buoyancy, and main heat transfer mode is heat transfer, and due to selection
The thermal coefficient of liquid be lower than bituminous pavement, therefore liquid column reduces the thermal conductivity of bituminous pavement entirety, reduces entrance
Frozen earth roadbed heat；In winter, the temperature of liquid column upper end is low, and the fluid density of upper end is high, and the temperature of liquid column lower end is high,
The fluid density of lower end is low, and under buoyancy, the liquid of lower part has the tendency that flowing up, and the liquid on top is also oriented to flow down
Dynamic trend, therefore have convection current generation, the heat transfer type of liquid column is conduction and convection current, therefore liquid column enhances bituminous pavement
Heat-sinking capability, increase the heat that roadbed discharges outward.
The utility model has the advantages that the application has the advantage that (1) is tied for the unidirectional heat dissipation asphalt pavement structure of Plateau Permafrost Areas
On structure, bituminous pavement is the first barrier of road structure and external environment heat exchange, and bituminous pavement lower thermal conductivity is to influence to freeze
The key factor of soil, the prior art radiate for roadbed, do not account for road surface heat dissipation problem but, and the present invention is directed to this point, mentions
Blacktop of sening as an envoy to has the function of thermal resistance conduction cooling, and from source, reduction summer enters the heat in road surface, accelerates in winter roadbed
Heat discharge outward, solve the problems, such as barrier of the bituminous pavement lower thermal conductivity to heat, and ensured road surface heat dissipation uniformly,
Solve the problems, such as that wide cut bituminous pavement heat absorption in Plateau Permafrost Areas is strong, conduction cooling is slow, heat dissipation is non-uniform, to alleviation frozen soil thaw collapse, protection
The highway construction of frozen soil and permafrost region is of great significance.(2) the cavity chamber internal surface in the application structure makes of sealing material
Encapsulation process does not need the rigid materials such as steel pipe, avoids using steel pipe or the sealing of other rigid materials, due to mixing with pitch
Material/soil matrix differences of mechanical properties is huge, and under load action, rigid material is easy to separate with road structure material, Wu Fafa
It is vaporized heat effect.(3) in cost, the subgrade engineering costly compared to hot pin etc., the application project amount is small, at low cost, for
Existing road surface, can cooperate pavement recycling technology, milling surface layer.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention；
Fig. 2 is indoor exposure experiment device figure (irradiating from the top down) of the invention；
Fig. 3 is indoor exposure experiment device figure (irradiating from bottom to top) of the invention；
Fig. 4 is the cooling effect comparison diagram (irradiating from the top down) of experimental group of the present invention and control group；
Fig. 5 is the cooling effect comparison diagram (irradiating from bottom to top) of experimental group of the present invention and control group.
Specific embodiment
Below with reference to the embodiment and attached drawing content that the present invention is furture elucidated.
Embodiment
A kind of unidirectional heat dissipation asphalt pavement structure for Plateau Permafrost Areas as shown in Figure 1, including bituminous pavement 5 and point
Cylindrical empty chamber 1 of the cloth in inside asphalt pavement, wherein bituminous pavement 5 be divided into from top to bottom superficial layer 2, middle surface layer 3 and under
Surface layer 4, in middle surface layer 3 and cutting optimal 4,1 inner surface of plenum chamber is solidifying by smearing melting heated bitumen for perforation setting vertically for plenum chamber 1
Then Gu the bitumen layer formed after is formed in plenum chamber 1 full of the conduction oil that thermal conductivity is 0.1-1.2W/mk as sealant
Liquid heat transfer channel.1 internal diameter 6-8mm of plenum chamber, height 6-14cm, the spacing between adjacent vacant chamber 1 are 7.5-10cm.
Its construction method the following steps are included:
(1) asphalt mixture gradation: the gradation for the asphalt that cutting optimal and middle surface layer use is AC-20, upper layer
The gradation of the asphalt used is AC-16C；
(2) it cutting optimal and middle surface layer road surfacing: in the good base of making, is spread respectively using paver and road roller
Bituminous pavement cutting optimal and middle surface layer are built, for cutting optimal with a thickness of 6-10cm, middle surface thickness is 2-6cm；
(3) it arranges liquid heat transfer channel: laying cavity in the bituminous pavement being laid with using punch device, and in cavity
Sealant is arranged in the side of room and bottom surface, assembles conduction oil, finally using the upper surface of sealing material sealing cavity room floor；
(4) asphalt road surface: spraying sticking layer oil on the middle surface layer top of bituminous pavement, be laid with upper layer, thick
Degree is 2-4cm.
Experimental example
Cooling effect pair in order to verify the validity of the unidirectional radiator structure of bituminous pavement of the present invention, with plain asphalt road surface
Than having carried out indoor irradiation experiment.
Production gradation is respectively AC-16 and AC-20, and the standard track plate test specimen having a size of 300 × 300 × 50mm uses
The cutting of the cutting machine quartering, obtains the experiment sample of 150 × 150 × 50mm, vertical drilling hole；Clear up the ash generated due to drilling
Dirt is sealed processing using the inner wall and bottom surface of melting heated bitumen device to hole, and after asphalt solidification, filling full thermal conductivity is
The conduction oil of 0.13W/mk, and the upper surface of melting heat bituminous seal cavity is reused, experiment sample is obtained, and on top
It is covered each by the identical asphalt concrete track plate of a block size with lower part, collectively forms experimental group；Control group is by three pieces
The identical asphalt concrete track plate through-thickness of size, which stacks, to be constituted.Experimental provision uses fluorescent lamp as simulating sun
Irradiation source, using temperature-sensing probe test test specimen in the temperature of different depth, the surrounding and bottom surface of experimental group and control group, which use, steeps
Foam insulation board is thermally insulated, and is tested Continuous irradiation 8 hours, including is irradiated and irradiated from the top down from bottom to top, keeps shining
It is identical with the height of fluorescent lamp to penetrate intensity, records the temperature variations of unidirectional radiator structure and plain asphalt road surface, experiment dress
It sets and sees attached drawing 2 and Fig. 3 respectively, wherein 1 plenum chamber, 6 fluorescent lamps, 7 temperature probes, 8 bituminous concretes, 9 cystosepiments.
Experimental result is shown in attached drawing 4 and attached drawing 5, it gives unidirectional radiator structure and the 2.5cm on plain asphalt road surface and
The temperature of 12.5cm depth changes over time.Whether from upper irradiation or from lower irradiation, the depth on the surface nearest by light source is made
For 0cm, the case depth farthest from light source is 15cm.When being irradiated from top, in 2.5cm depth, the temperature of unidirectional radiator structure
Degree is higher than plain asphalt road surface, is lower than plain asphalt road surface in the temperature of 12.5cm depth, unidirectional radiator structure；It is shone from lower part
When penetrating, it is lower than plain asphalt road surface in the temperature of 2.5cm depth, unidirectional radiator structure, it is unidirectional to radiate in 12.5cm depth
The temperature of structure is higher than plain asphalt road surface.When illustrating that upper temp is high, the heat transfer efficiency of experimental group is lower than control group, identical
In time, less heat bottom；When temperature of lower is high, the heat transfer efficiency of experimental group is higher than control group, in the same time,
By liquid heat transfer channel, more heats have been dispersed into top, it was demonstrated that the bituminous pavement unidirectional radiator structure is effective.
Claims (7)
1. a kind of unidirectional heat dissipation asphalt pavement structure for Plateau Permafrost Areas, which is characterized in that including bituminous pavement (5) and divide
Plenum chamber (1) of the cloth in inside asphalt pavement, wherein the bituminous pavement (5) is divided into superficial layer (2), middle surface layer from top to bottom
(3) it is led with cutting optimal (4), plenum chamber (1) setting in middle surface layer (3) and cutting optimal (4), interior be full of of the plenum chamber (1)
Hot oil forms liquid heat transfer channel.
2. the unidirectional heat dissipation asphalt pavement structure according to claim 1 for Plateau Permafrost Areas, which is characterized in that described
Plenum chamber (1) inner surface is equipped with sealant.
3. the unidirectional heat dissipation asphalt pavement structure according to claim 2 for Plateau Permafrost Areas, which is characterized in that described
Sealant is to smear the bitumen layer formed after melting heat asphalt solidification.
4. the unidirectional heat dissipation asphalt pavement structure according to claim 1 for Plateau Permafrost Areas, which is characterized in that described
Perforation is arranged in middle surface layer (3) and cutting optimal (4) plenum chamber (1) vertically.
5. the unidirectional heat dissipation asphalt pavement structure according to claim 1 for Plateau Permafrost Areas, which is characterized in that described
Plenum chamber (1) is the cylinder of internal diameter 6-8mm, height 6-14cm, and the spacing between adjacent vacant chamber (1) is 7.5-10cm.
6. the unidirectional heat dissipation asphalt pavement structure according to claim 1 for Plateau Permafrost Areas, which is characterized in that described
The thermal conductivity of conduction oil is 0.1-1.2W/mk lower than the thermal conductivity of asphalt used in road surfacing.
7. the construction method of any unidirectional heat dissipation asphalt pavement structure for Plateau Permafrost Areas of claim 1-6 kind,
It is characterized in that, comprising the following steps:
(1) asphalt mixture gradation: the gradation for the asphalt that cutting optimal and middle surface layer use is AC-20, and upper layer uses
The gradation of asphalt be AC-16C；
(2) cutting optimal and middle surface layer road surfacing: in the good base of making, using paver and road roller difference making drip
Green road surface cutting optimal and middle surface layer, for cutting optimal with a thickness of 6-10cm, middle surface thickness is 2-6cm；
(3) it arranges liquid heat transfer channel: laying cavity in the bituminous pavement being laid with using punch device, and in plenum chamber
Sealant is arranged in side and bottom surface, assembles conduction oil, finally using the upper surface of sealing material sealing cavity room floor；
(4) asphalt road surface: spraying sticking layer oil on the middle surface layer top of bituminous pavement, be laid with upper layer, with a thickness of
2-4cm。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811208256.6A CN109338841B (en) | 2018-10-17 | 2018-10-17 | One-way heat dissipation asphalt pavement structure for plateau permafrost region and construction method thereof |
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| CN201811208256.6A CN109338841B (en) | 2018-10-17 | 2018-10-17 | One-way heat dissipation asphalt pavement structure for plateau permafrost region and construction method thereof |
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| CN109338841A true CN109338841A (en) | 2019-02-15 |
| CN109338841B CN109338841B (en) | 2021-02-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113684736A (en) * | 2021-08-10 | 2021-11-23 | 天津亚平市政工程集团有限公司 | Efficient heat transfer road and construction method thereof |
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