CN102561143A - Pavement structure of concrete highway in alpine region - Google Patents
Pavement structure of concrete highway in alpine region Download PDFInfo
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- CN102561143A CN102561143A CN2012100604322A CN201210060432A CN102561143A CN 102561143 A CN102561143 A CN 102561143A CN 2012100604322 A CN2012100604322 A CN 2012100604322A CN 201210060432 A CN201210060432 A CN 201210060432A CN 102561143 A CN102561143 A CN 102561143A
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Abstract
The invention relates to a highway pavement structure, in particular to a freeze-thaw resisting and water-proof cement concrete pavement with a gradient function. The pavement structure is composed of three layers of structures with gradient thermal conductivity, and the thermal conductivity of each layer descends from top to bottom, so as to cause heat to be emitted from the roadbed to the air, prevent heat in the air from spreading to the roadbed, keep the stability of a frozen soil layer, and play the role of protecting the roadbed in alpine region. The pavement structure is composed of a low intensity normal concrete layer, a moderate intensity concrete layer, a water-proof layer and a roller compaction fiber concrete layer. The pavement structure has the characteristics of highly water-proof and freeze-thaw resisting properties, and the integrated using function of the pavement is improved, therefore, the durability of the concrete pavement is extended, and the economic benefit is improved.
Description
Technical field
The present invention relates to a kind of highway concrete road surface structure, the concrete highway pavement structure that particularly a kind of extremely frigid zones is suitable for.
Background technology
Cement concrete pavement commonly used is that the cement paste that uses materials such as cement, water, sand and Admixture to form is binding material, and rubble is an aggregate, and sand is inserts; Through mix, pave, vibrate and individual layer road surface that maintenance is built, thickness is generally 220-280mm; Its rigidity is big, belongs to fragile material.On waterproofing course road surface commonly used, vehicle because the pump-absorb action of tire, has the generation of normal direction drawing stress in the process of moving at the interface at waterproofing course and bridge deck.Supercrust might be thrown off under the effect of this type of normal direction drawing stress, damages.The bigger shear stress of the inner generation of layer simultaneously causes the shear strain of uncertain destruction face, produces relative displacement generation shear failure in the horizontal direction, produces diseases such as passing, gather around bag.In a word, cracking often appears in road surface prematurely under the effect of various stress such as tension and compression, breathing, impact, peel off and disease such as slippage, influence the road structure function of use, even causes differential settlement, causes durability destruction.These diseases all have direct relation with the infiltration and the delay of water.Freeze thawing phenomenon in the extremely frigid zones subgrade soils is serious, the frozen-thaw process that replaces repeatedly and make roadbed differential settlement occur, thus cause highway subgrade unstable.
Aspect solution road surface freeze thawing, generally take to raise roadbed, crushed stone roadbed at present, technology such as heat pipe or insulation layer are set.Raising roadbed is one of modal engineering measure of adopting.But see from actual engineering; Like the Qinghai-Tibet Highway section roadbed height has been raised about 3 meters; But the difference that has occurred between the male and female face roadbed temperature field causes subgrade defect, and sunny side occurs caving in and longitudinal cracking, and simultaneously elevated formation level has also brought roadbed under to such an extent that the thawing interlayer thickens; The roadbed settlement distortion strengthens, for the stability of roadbed is brought great hidden.The gradient function method for designing occurs in a large number in recent years, but mainly concentrate on Aero-Space, machinery, electronics, medical advanced composite material field, and the application in civil engineering material is not also carried out in a large number, especially in the pavement construction material field.The cement concrete single layer designs is still main flow, and its cost and construction technology are lower, but poor durability.If adopt gradient function rigid pavement cost higher, but take all factors into consideration later maintenance and durability, then show higher cost performance.A kind of supercrust with gradient thermal conductivity is disclosed like existing patent of invention (application publication number CN102084064A), high through adding at different layers, in and the micro-nano powder of lower thermal conductivity realize the thermal conductivity gradient, but this cost is higher and the construction complicated.
Aspect the solution road surface waterproof; Commonly used is the SBS polymer modified bituminous waterproof sheet material; Because SBS is a kind of high molecular polymer, with special composite material in pitch, mix form netted, big limitations the degree of freedom of pitch micella; Thereby waterproof, bonding, shear resistance all improve greatly, are fit to very much replace common emulsified asphalt to be used for highway and pass through layer, slurry seal, adhesion coating construction.But owing to be that what usually to adopt is coiled material; Unavoidably can just separate by water layer, do not reach the technique effect of waterproof with concrete.This shows that existing polymer modified bituminous waterproof sheet material can't finely satisfy the needs of waterproof, the not firm quality problems of bonding can often take place.Some adopts the layering waterproof construction in addition, discloses a kind of waterproof pavement structure like existing patent of invention (application publication number CN101831855A), and this structure is the multilayer flashing structure that is made up of surface layer, basic unit, waterproofing course, drainage blanket and permeable filtration beds.This pavement construction requirement and cost are all higher.
The Fu Zhi of Research Institute of Highway Ministry Transport etc. are at " fiber concrete pavement construction technology " literary composition (highway; The 1st phase of January in 2011: point out 36-40) that there has been the history in more than 20 year in China in the test of the Research And Engineering aspect the steel fiber feinforced cement rigid pavement; " highway cement concrete pavement construction technique normalizing " shown the relevant provision of Steel Fibre Concrete Pavements construction technology in (JTGF30-2003), but actual engineering use and few.Reason is that the price of present steel fibre is more and more expensive, and the construction cost per square meter of steel fibrous concrete exceeds 2 times than ordinary concrete.Mix and stir promoting the use of of Steel Fibre Concrete Pavements and receive the restriction of high cost.Yao Wuzai " research of a concrete of poly-acrylonitrile fiber cryogenic property " literary composition (the constructional materials journal of concrete material research National Key Laboratory of Tongji University; The 6th the 3rd phase of volume of September in 2003: point out 243-247) that the low-dosage polyacrylonitrile fibre can alleviate the concrete damage that is caused by the low temperature circulation effectively, mechanism is split in the resistance of fiber simultaneously to be made concrete can resist bigger thermal stresses and has higher bent toughness.The modulus of elasticity of polyacrylonitrile fibre reduces the characteristic that improves opposing frost heaving failure under the fibrous concrete low temperature environment is had the front reinfocing effect with temperature.Fine PP nitrile fiber has improved concrete early stage internal flaw; Reduced the initial fissure yardstick; Improve concrete tension limiting strain and energy to failure, thereby be of value to the raising that gain in strength and concrete antifreezing under the concrete low temperature environment melt durability.That is to say that concrete of poly-acrylonitrile fiber is specially adapted to cold district.
See also there is not the guard method that a kind of cost is low and have the good protection effect from existing high and cold district highway subgrade guard method.Making satisfies intensity, freeze thawing resistance, waterproof and durable highway and is one problem to be solved is arranged in high and cold district.
Summary of the invention
Technical problem:For solving the problem that exists in the background technology, the present invention proposes a kind of extremely frigid zones and has the freeze thawing resistance of gradient function and the cement concrete pavement of waterproof.This road structure is incorporated into gradient function and waterproofing design method in the road design.The gradient function method for designing is to adopt advanced complex technique, and two or more different materials is made up, and makes its structure reach continuous gradient and changes, and obtains performance and is continuous smooth change.It is for adapting to the advanced design theory that high-technology fields such as Aeronautics and Astronautics and advanced power propose material.The design is incorporated into the gradient function method for designing in the concrete road surface structure design, utilizes the concrete thermal conductivity different characteristic of varying strength, and road pavement successively designs; And even transition is carried out at the concrete interface of different layers handle; The change of gradient of intensity, rigidity, adhesive property and the durability of realization from the base plate to the surface course is carried out particular design to surface texture simultaneously, improves impervious, antifreeze and anti-wear performance; Effectively improve the road surface adaptive capacity of complexing action to external world; Improve the comprehensive function of use in road surface, thereby prolong the rigid pavement durability, increase economic efficiency.In structure, lay one deck waterproofing course in addition to improve water resistance.
Technical scheme:Road structure of the present invention is divided into four layers, is low-intensity ordinary concrete layer (4), middle intensity layer of concrete (3), waterproofing course (2) from top to bottom successively and rolls fibrous concrete layer (1).Low-intensity ordinary concrete (4) is processed by the C20-C25 concrete, and its thickness is about 10-12cm.Middle intensity ordinary concrete layer (3) is processed by the C30-C40 concrete, and its thickness is about 8-10cm.Waterproofing course (2), adopting by polyester blank or the compound tire of glass is the waterproofing materials that carcass, dip-coating SBS modified bitumen are processed, it has high temperature and does not trickle, low temperature characteristics such as do not fission.Waterproofing layer thickness is about 3-5cm.Roll fibrous concrete layer (1),, utilize fiber with the stress absorption ability and the bending tensile strength that increase substantially cement concrete and strengthen abrasion resistance, impermeability and durability by adding of fiber material in the C45-C50 concrete.Like polyacrylonitrile fibre commonly used.Its thickness is about 8-10cm.
Further, described in the aspect of intensity layer of concrete (3) 5-8m of being separated by be provided with the dovetail groove of wide 10-15cm, dark 2-3cm, when laying waterproofing course, fill with waterproofing course by the SBS modified bitumen and to be integral, improve the ability of the shear failure between resistant layer.
Visible by technique scheme, this road structure of the present invention has following advantage:
(1) utilizes varying strength concrete thermal conductivity different characteristic; Road pavement successively designs; And even transition is carried out at the concrete interface of different layers handle; The change of gradient of intensity, rigidity, adhesive property and the durability of realization from the base plate to the surface course is utilized to have formed a kind of road structure with gradient thermal conductivity of one-way heat conduction function.Successively decreasing in this road surface thermal conductivity from top to bottom, thereby makes the road surface form the individual event passage of heat from the roadbed to the air, and heat is dispersed into the air from roadbed easily; And stop heat frozen soil transmission below roadbed and roadbed on road surface, frozen soil shows as the heat release state all the time, thereby avoids frozen soil because the freeze thawing pathology that heat accumulation produces; Realized the difference in functionality transition of rigid pavement from the bottom surface to the surface; Alleviated the performance nonuniformity between pavement concrete and the base material, improved the comprehensive function of use of road surfaces simultaneously, like wear-resisting, impervious and cling property etc.; Improve integrally-built durability, reached the effect of protection high and cold district highway and roadbed.
(2) in structure, laying the employing of one deck waterproofing course is the waterproofing materials that carcass, dip-coating SBS modified bitumen are processed by polyester blank or the compound tire of glass.The main feature of polymer SBS modified bitumen bonding waterproofing course: the one, make the bottom of covering pitch form bitumen layer, its underpart also has one deck to approach asphalt membrane simultaneously, and bitumen layer forms a bonding waterproofing course, good water-proof effect jointly with thin asphalt membrane; The 2nd, its elastic return is good, can significantly alleviate the destruction to it of lower floor or crack, upper strata; The 3rd, the bonding waterproofing course can play the effect of stress absorbing layer, can delay the base-layer contraction caused reflection crack that ftractures; The 4th, can adopt mechanized construction, fast, the easy to control the quality system of speed of application.In addition, in bonding surface design, below the concrete layer 5-8m of being separated by be designed with the dovetail groove of wide 10-15cm, dark 2-3cm, when laying waterproofing course, fill with waterproofing course by the SBS modified bitumen and to be integral, improve the ability of the shear failure between resistant layer.
(3) supercrust adopts and rolls fibrous concrete, compares with conventional concrete, reduces cement mixing content and water supply volume; Disorderly improved concrete internal construction to the fiber that distributes, it is strong to make it have crack resistance, good toughness; Intensity is high; Good frost resistance, the advantage that antifatigue and impact property are strong, the characteristic of raising are resisted frost heaving failure down to the fibrous concrete low temperature environment and are had the front reinfocing effect.Fine PP nitrile fiber has improved concrete early stage internal flaw; Reduced the initial fissure yardstick; Concrete tension limiting strain and energy to failure have been improved; Thereby be of value to the raising that gain in strength and concrete antifreezing under the concrete low temperature environment melt durability, be specially adapted to cold district.Therefore this road surface has good economic benefit.
Description of drawings
Fig. 1 is a structural representation of the present invention
Wherein: 1---roll the fibrous concrete layer; 2---waterproofing course; 3---middle intensity ordinary concrete layer; 4---low-intensity ordinary concrete layer; 5---roadbed.
Fig. 2 is 1.-1. sectional drawing among Fig. 1.
The specific embodiment
Below in conjunction with accompanying drawing and the specific embodiment the present invention is done and to describe in further detail:
Visible through Fig. 1, this road surface is laid four layers altogether.Be respectively: roll fibrous concrete layer (1), waterproofing course (2), middle intensity ordinary concrete layer (3), low-intensity ordinary concrete layer (4).
Take mechanical execution, carry out surfacing, as truly have basic unit's superelevation part, should adopt manual work to exclude, can not employ machinery, otherwise very easily cause the large tracts of land of basic unit loosening, influenced the uniformity of foundation base intension according to the road surface situation; For basic unit's absolute altitude weak point, can not fill up with base mixture, should use with the moulding of (4) layer concrete one-off construction.
At first lay low-intensity ordinary concrete (4), processed by the C20-C25 concrete, its thickness is about 10-12cm.Intensity ordinary concrete layer (3) in laying is then processed by the C30-C40 concrete, and its thickness is about 8-10cm.Re-lay waterproofing course (2), can adopt by polyester blank or the compound tire of glass is the waterproofing materials that curls that carcass, dip-coating SBS modified bitumen are processed, and it has high temperature and does not trickle, low temperature characteristics such as do not fission.Waterproofing layer thickness 3-5cm.Lay at last and roll fibrous concrete layer (1),, utilize fiber with the stress absorption ability and the bending tensile strength that increase substantially cement concrete and strengthen abrasion resistance, impermeability and durability by adding of fiber material in the C45-C50 concrete.Like polyacrylonitrile fibre commonly used.Its thickness is about 8-10cm.
Implement with reference to " highway cement concrete pavement construction technique normalizing (JTGF30-2003) " when intensity ordinary concrete layer (3) and low-intensity ordinary concrete layer (4) in the laying.Comprise following operation: the roadbed shaping; Mix concrete in proportion; Pave and flatten.The be separated by dovetail groove of the prefabricated wide 10-15cm of 5-8m, dark 2-3cm of aspect during intensity ordinary concrete layer (3) in note laying.
Notice that modified bitumen should spray when laying waterproofing course (2) under the temperature of code requirement, pitch sprinkling car should keep certain pressure and at the uniform velocity go, and is even to guarantee pitch sprinkling, sprays excessive place, should strike off.And detecting the cloth amount of spilling by relevant requirements in " highway subgrade road surface on-the-spot test rules (JTJ059-95) " and method, each detection is no less than 3 places.Pitch sprinkling equipment should be equipped with and be applicable to that different denseness pitches spray the nozzle of usefulness, bituminous distributor spray less than ground can adopt the manual cloth that spills.The place that sprinkling excess, leakage are spilt or spilt less should be corrected.Should spray slowly in order to avoid the slit occurs by hand at the dovetail groove place.During spraying modified pitch, spray bar should form about 30 ° of angles with road surfaces, and suitable height is arranged, so that the modified bitumen that sprays on the road surface forms is overlapping.Spill the cloth modified bitumen, pitch must system-wide completely be spread, and reaches the requirement of phenomenons such as no broken hole, leakage shop, disengagement.
When laying rolls fibrous concrete layer (1), in one cubic metre of roller compacted concrete, add 1 kilogram of polyacrylonitrile fibre, in mixer, stir.The compound that fibrous concrete mixes and stirs out is not all answered conglomeration, when finding clustering phenomena is arranged, should on mixer, be equipped with the fiber machine that is uniformly distributed with and effectively eliminate clustering phenomena.Transport this compound to method that on-the-spot back adopts machinery to pave; Evenly pave on waterproofing course (2) by thickness 8-10cm; Do not adopt the vibrating method construction of traditional water cement concrete, but steamroller, degree of compaction (>=95%) back of rolling to code requirement forms.
Claims (2)
1. extremely frigid zones concrete highway pavement structure, it is characterized in that: road structure is divided into four layers, is low-intensity ordinary concrete layer (4), middle intensity layer of concrete (3), waterproofing course (2) from top to bottom successively and rolls fibrous concrete layer (1); Described low-intensity ordinary concrete (4) is processed by the C20-C25 concrete, and its thickness is 10-12cm; Intensity ordinary concrete layer (3) in described is processed by the C30-C40 concrete, and its thickness is 8-10cm; Described waterproofing course (2), adopting by polyester blank or the compound tire of glass is that carcass, dip-coating SBS modified bitumen are processed the about 3-5cm of its thickness; The described fibrous concrete layer (1) that rolls adopts and is processed by adding of fiber material in the C45-C50 concrete, and its thickness is 8-10cm.
2. a kind of extremely frigid zones concrete highway pavement structure according to claim 1; It is characterized in that: the aspect of intensity layer of concrete (3) 5-8m of being separated by is provided with the dovetail groove of wide 10-15cm, dark 2-3cm in described; When laying waterproofing course, be integral with waterproofing course by the filling of SBS modified bitumen.
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| CN2012100604322A CN102561143A (en) | 2012-03-09 | 2012-03-09 | Pavement structure of concrete highway in alpine region |
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| CN2012100604322A CN102561143A (en) | 2012-03-09 | 2012-03-09 | Pavement structure of concrete highway in alpine region |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105113351A (en) * | 2015-08-06 | 2015-12-02 | 中国水利水电第六工程局有限公司 | Concrete pavement structure in alpine region and construction method thereof |
| CN109235174A (en) * | 2018-10-19 | 2019-01-18 | 东南大学 | A kind of seamless pavement structure based on fiber reinforcement type cement-base composite material |
| CN113026470A (en) * | 2021-03-26 | 2021-06-25 | 河北雄安荣乌高速公路有限公司 | Enhanced base-surface layer interlayer bonding combined structure and optimization method thereof |
| EP4105385A1 (en) * | 2021-06-18 | 2022-12-21 | Technys Rail | Slab for construction and method for manufacturing such a slab |
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| CN2755167Y (en) * | 2004-12-31 | 2006-02-01 | 张涵 | Water-proof structure of concrete road surface |
| CN201003134Y (en) * | 2006-12-30 | 2008-01-09 | 易志坚 | Rolled flexible fiber cement concrete pavement structure |
| CN101109168A (en) * | 2007-08-16 | 2008-01-23 | 西安公路养护技术工程研究中心有限公司 | Interlamination processing method for high grade road asphalt road surface |
| CN201660820U (en) * | 2010-03-26 | 2010-12-01 | 长沙理工大学 | High-durability cement concrete pavement slab with gradient function |
| CN102084064A (en) * | 2009-12-31 | 2011-06-01 | 中交第一公路勘察设计研究院有限公司 | Method for protecting roadbeds in frozen soil area and pavement structure |
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- 2012-03-09 CN CN2012100604322A patent/CN102561143A/en active Pending
Patent Citations (6)
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| JPH04277202A (en) * | 1991-03-05 | 1992-10-02 | Toa Doro Kogyo Kk | Pavement body having water-proof layer |
| CN2755167Y (en) * | 2004-12-31 | 2006-02-01 | 张涵 | Water-proof structure of concrete road surface |
| CN201003134Y (en) * | 2006-12-30 | 2008-01-09 | 易志坚 | Rolled flexible fiber cement concrete pavement structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105113351A (en) * | 2015-08-06 | 2015-12-02 | 中国水利水电第六工程局有限公司 | Concrete pavement structure in alpine region and construction method thereof |
| CN109235174A (en) * | 2018-10-19 | 2019-01-18 | 东南大学 | A kind of seamless pavement structure based on fiber reinforcement type cement-base composite material |
| CN113026470A (en) * | 2021-03-26 | 2021-06-25 | 河北雄安荣乌高速公路有限公司 | Enhanced base-surface layer interlayer bonding combined structure and optimization method thereof |
| EP4105385A1 (en) * | 2021-06-18 | 2022-12-21 | Technys Rail | Slab for construction and method for manufacturing such a slab |
| FR3124204A1 (en) * | 2021-06-18 | 2022-12-23 | Fmam | Slab for the construction and method of manufacturing such a slab |
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Application publication date: 20120711 |