CN103556558A - Pavement construction with hierarchically completely encapsulated roadbed and construction method thereof - Google Patents
Pavement construction with hierarchically completely encapsulated roadbed and construction method thereof Download PDFInfo
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- CN103556558A CN103556558A CN201310500013.0A CN201310500013A CN103556558A CN 103556558 A CN103556558 A CN 103556558A CN 201310500013 A CN201310500013 A CN 201310500013A CN 103556558 A CN103556558 A CN 103556558A
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Abstract
The invention provides a pavement construction with a hierarchically completely encapsulated roadbed and a construction method thereof. The pavement construction comprises the roadbed which is of a multi-layer structure; a waterproof roadbed enhancement layer is completely encapsulated on each layer of roadbed in a sealing manner, and the layers are superposed to form the overall roadbed. By adopting the pavement construction, water exchange of a roadbed bearing layer and the outside is blocked up while the bearing capacity and the stability of the roadbed are improved; surface water, roadbed slope ooze water and underground water can be prevented from entering the roadbed bearing layer and the pavement construction to affect the bearing capacity and the stability; moisture content control of a roadbed material also can be ensured while water damage is effectively solved, so that the roadbed normally works under the optimal moisture content in construction control for a long period of time; deterioration of the bearing capacity and the stability and serious differential settlement caused by moisture evaporation loss and heterogeneous migration of the roadbed are avoided; the use and full utilization of local materials in roadbed construction in areas with expansive soil, collapsible soil and the like with strong water sensitivity also can be achieved by virtue of stable control on the moisture content of the roadbed, and excavated spoiling, filling and borrowing of materials and transportation are avoided, so that the construction costs are saved, and energy conservation and environment protection are achieved.
Description
Technical field
The present invention relates to a kind of pavement structure and job practices thereof, pavement structure and the job practices thereof of the full bag of especially a kind of roadbed layering.
Background technology
In fields such as different kinds of roads, airfield runway and urban operating mechanisms, pavement life problem is the key factor that affects its use cost, and, there is the maintenance after damage in road, also can affect the normal operation of whole municipal administration, economy, thereby be all problem demanding prompt solution in construction the application life of how to improve road for a long time.And that the reason that causes road surface early damage, the lost of life has is many; Wherein, stressed, the antivibration of the coordination between road surface and each feature capability layer and ponding are all main causes that pavement life shortens; Water has leading role to the damage of road, and road surface Water Damage can be divided into road table Water Damage and underground water damages two kinds.
Road table Water Damage, be mainly show the way table water (as rainwater) by surface layer hole, seam or crack, enter surface layer inside, cause surface material Water Damage, water further infiltrates basic unit, cause basic unit to move water erosion damage, and between surface layer and basic unit, form non-homogeneous coming to nothing and non-homogeneous supporting, for asphalt concrete pavement, the moving water of interlayer washes away the adhesion stress that also can weaken surface layer and basic unit, is unfavorable for that asphalt concrete pavement is stressed.Under water is further again, infilter into roadbed, if subgrade drainage is bad, make it be immersed in water for a long time, roadbed material intensity and bullet mould reduce, and easily cause destabilization of roadbed, then cause basic unit's depression, fracture, finally cause surface layer to occur purt mud phenomenon, depression and rupture failure.Aspect the table Water Damage of solution road, existing road surface has the measure that porous Drainage Base is set between surface layer and basic unit, beyond the table water discharge road surface, road of infiltration basic unit, and has obtained good effect.
Underground water damages, and refers to the larger roadbed soil of humidity or the higher area of groundwater table, and the water in roadbed soil, roadbed bottom or cut slope enters by capillarity or side seepage the pavement destruction that road structure inside causes.Underground water corrodes basic unit for a long time, weakens the bulk strength of subbase, basic unit, reduces the modulus of base material, and influence of dynamic water also can accelerate basic unit's destruction simultaneously, thereby causes top course depression, rupture failure.In addition, when underground water enters road structure inside, under the continuous extruding of carload especially heavy duty, also can be accompanied with a small amount of roadbed fine grained soils, cause roadbed fine grained soils to run off, roadbed bulk strength reduces and affects road structure bearing capacity, and roadbed fine grained soils also can cause road surface frequently to occur purt mud phenomenon with the subsidiary rising of water, the fine grained soils rising also can stop up permeable bed course passage, causes impeded drainage.In addition, in cold area in north, underground water also can cause the frost heaving failure of roadbed, has aggravated the reduction of service life of road surface.In subgrade soils, exist countless capillary tubies, underground water can be inner to roadbed by the capillary rise in roadbed, especially in the winter time, and when atmosphere subzero temperature imports into underground, Free water in earth's surface is glaciation crystal first, along with the continuation of temperature declines, in conjunction with the outermost layer of water, also start to freeze, ice crystal is expanded gradually, and in soil layer, form ice band, the freezing rear volume of moisture will increase, and the soil body is swelled along with expanding, and occur frost heaving.In soil, particulate is more, and the capillary tube of formation is just more, also larger on the frost heave impact of roadbed.Therefore must effectively stop the structural damage of underground water road pavement.
The measure that existing prevention underground water enters ground mainly contains: the first, the permeable bed courses such as gravel, porous cement treated macadam are set, and this measure can reduce capillary tube, controls the rising quantity of underground water.But still have part water to continue to rise to road structure inside by capillarity.Meanwhile, in the higher section of groundwater table, because roadbed is for a long time in dampness, the continuous effect of vibration of traffic load, will make roadbed soil softening, soil particle attenuate, and under load vibration-extrusion, the subsidiary roadbed fine grained soils of underground infiltration rises.Roadbed fine grained soils rises to bed course and brings two adverse consequences: the one, and roadbed fine grained soils runs off, and causes subgrade soils strength decreased, causes pavement depression and destroys; The 2nd, roadbed fine grained soils rises and fills the hole of permeable bed course, easily causes bedding course drainage not smooth, and because bed course porosity diminishes, capillary tube attenuates, it is large that rise waterborne becomes, and strengthened the capillarity of water, and underground water more easily rises to even surface layer of basic unit by capillarity.Basic unit on bed course is all stabilized with inorganic binder rigid substantially, himself be difficult to stop completely the infiltration of water, and drying shrinkage and warm draw line ubiquity, these are carried secretly by capillarity to underground water undoubtedly, and roadbed fine grained soils rises to basic unit together and surface layer provides passage, causes thus basic unit, surface layer Water Damage and mud pumping phenomenon.Meanwhile, the construction quality of the permeable bed course of porous cement treated macadam class requires high, and the mixing of permeable bed course compound is high especially to the requirement of water supply volume, if water supply volume is too small, easily loose when rolling compound; If water supply volume is excessive, easily there is segregation phenomenon.Construction control is bad, will affect its drainage effect, and porosity reduces provides capillary channel.The second, in the winter of cold area in north, for solving roadbed frost heaving failure, conventionally adopt and change the way of banketing, if water good stability, non-heaving soil or swelling soil change the top of filling out roadbed, as sand, gravel, slag etc.Adopt this measure can greatly alleviate the frost heave degree of roadbed, but the problem existing is that, due to the rising of capillary water, underground water still can cause the frost heaving failure of road structure inside.Even if permeable bed course is set again, capillary water also can infiltrate in bed course and congeal into ice, and causes bed course frost heaving.Bed course generation frost-heaving deformation, basic unit be must be subject to and its vertical direction and the tangential constraint of interlayer given, this constraint is stronger, the restraint forces that bed course is subject to is just larger, correspondingly, the reaction force that bed course gives basic unit is also just larger, and this reaction force comprises that bed course is for the extruding force of basic unit and the tangential shearing of interlayer or frictional force (to basic unit, this shearing or frictional force performance are basic unit's bottom tension).Semi-rigid sub-base material has higher compressive strength, can resist the compressive stress that extruding force produces, but, the tensile strength of semi-rigid sub-base material is less, interlayer tangential force makes basic unit's tension, and then Hui Dui basic unit causes adverse effect, even when this tensile stress reaches its tensile strength, there is base course crack, cause pavement destruction.In addition, for surface layer, be rigid road structure, for example, while being cement concrete pavement, because the rigidity of surface layer is stronger, under heavy load effect, the as easy as rolling off a log even fracture that deforms, destroys road surface, and then goes down to the grass-roots units passage is provided for road table water.
Meanwhile, in existing road structure, the variation for load between each functional layer does not have the coordination ability, and because impact underground and surface water there will be differential settlement, thereby early damage occurs respectively, also can cause the life-span of road structure to be reduced.
In prior art, for addressing the above problem, there is a kind of waterproof antivibration road structure; Employing arranges waterproof shock-absorption layer and be provided with water-permeable filter layer between roadbed and bed course arranging between bed course and basic unit between waterproofing course, basic unit and road surface; When can make to a certain extent underground water increase to enter bed course to discharge beyond road surface, roadbed fine grained soils can effectively be blocked or particle is brought into permeable bed course by underground water, avoid the loss of roadbed fine grained soils or particle, reduce pavement depression, also can avoid the hole of roadbed fine grained soils or the permeable bed course of Particle Blocking; Having avoided waterproofing course contacts with basic unit and the direct of bed course, interlayer contact face is relatively smooth, has greatly reduced the frictional force between basic unit and bed course, while making bed course frost heave or thermal expansion distortion, basic unit greatly alleviates the tangential effect of contraction of its interlayer, thereby has avoided the infringement of waterproof layer material; Because film class waterproofing course has the ability of certain adaptive deformation, can play the effect of stress absorption and compatible deformation, be beneficial to basic unit stressed; Due to the setting of waterproofing course, block underground water continuation rising and entered basic unit and surface layer, avoid the basic unit and the surface layer frost heaving failure that due to underground water, rise and cause; Therefore, arrange after waterproofing course, stop underground water further to rise to basic unit and surface layer, when effectively solving underground water damage, pavement disease and the destruction problem that cause winter because of underground water frost heave will significantly be reduced, meanwhile, can also stop surface water to enter roadbed by bed course, avoid the roadbed damage by water and the mud pumping phenomenon that cause thus; Owing to effectively having stoped the rising of underground water, the in the situation that of causing porosity to reduce because quality control on construction is bad at permeable bed course, can prevent the existing hole of the permeable bed course of roadbed fine grained soils or Particle Blocking, can not cause porosity further to reduce even to stop up; Waterproof shock-absorption functional layer can stop surface water to penetrate into the destruction that inner road pavement structure causes, and is tested and is shown simultaneously by drop-weight impact, and waterproof shock-absorption functional layer can effectively improve anti-vibrating and impact ability.
Although said structure can solution aforementioned technical problem to a certain degree (mainly solve surface water and enter basic unit and roadbed from top to bottom from surface layer top, underground water enters basic unit and surface layer from bottom to top from roadbed end face), but, the Atmospheric precipitation of filled-up ground, other other water sources of infiltration embankment and roadbed still can infiltrate roadbed inside by roadbed side slope or substrate side, the rainwater of cut subgrade side slope (soil-slope that especially permeability is large etc.), earth's surface infiltration, underground water also can enter into roadbed roadbed by road both sides and ground basal part, like that, water enters roadbed from various channels or mode and makes it water content and surpass roadbed design optimum moisture content, capital causes the decline of its strength and stability, degree slightly seriously will cause the destruction of road structure.Especially for expansive soil, tuffs etc. have water-swellable disintegration, the soil property of dehydration retractable property sensitivity or rock matter roadbed material, moisture expansion and drying shrinkage effect is obvious, the slight variation of water content all can cause significant pavement disease, so, guarantee that roadbed material stablizing under optimum moisture content is extremely important, therefore except preventing that secondary water from entering roadbed from all directions and making water content increase, also need to prevent the subgrade moisture evaporation causing because of weather and environment change, moving the water content that runs off and cause reduces, this is also the formed road structure long-term existence cracking of this type of roadbed material, depression, the subject matter that the destruction and being difficult to such as cave in effectively solves.
In addition, said structure lacks contribution to roadbed self bearing capacity and stability under loading, at high filling section, usually roadbed side slope is made to stepped ramp type and compared with gentle incline, floor space is larger, and in these high-fill roadbed sections and some Special Roadbed sections, formation perforation that the decline of subgrade rating and stability can cause potential slide plane are connected, and cause the settlement failure of side slope cracking, landslide and road structure etc.; Simultaneously, although said structure is for road surface upper body, antivibration effect makes moderate progress, but the adhesion effect due to roadbed both sides, in ground when there is differential settlement and resist vibration vibrations, the independence of roadbed, globality and stability are not enough, and the adaptive deformation coordination ability is not strong, be easy to occur local disease, local disease can further be deepened the adverse effect of surface water and groundwater to road structure.
Therefore, need a kind of pavement structure, each functional layer has omnibearing waterproof effect, both avoid the water sources such as Earth Surface Atmosphere precipitation, underground water and immerseable embankment to infiltrate from all directions the subgrade and pavement that subgrade moisture content is increased and cause and destroyed, and also avoided subgrade moisture loss water content is reduced and subgrade and pavement is damaged; Simultaneously, functional layer is guaranteeing on the basis of comprehensive waterproof effect, also there is the effect of reinforcement, confinement effect enhancing subgrade and pavement bearing capacity, stability and durability, and guarantee globality and the independence of roadbed, make subgrade and pavement integral body can coordinate better stress deformation when being subject to load, impact, reduce the local failure occurring because of vibratory impulse, geological process.
Summary of the invention
In view of this, the pavement structure and the job practices that the object of this invention is to provide the full bag of a kind of roadbed layering, each functional layer of pavement structure has omnibearing waterproof effect, guarantee the stable control of subgrade moisture content, both avoided extraneous water source to enter roadbed, can make again the unlikely loss of subgrade moisture content, thereby the pavement destruction of avoiding subgrade moisture content off-target value and causing, roadbed is had and strengthened completely continuously and parcel confinement effect humidification simultaneously, bearing capacity and the stability of subgrade and pavement integral body are significantly strengthened, be subject to load and impact, during vibrations, can coordinate better stress deformation.
The pavement structure of the full bag of roadbed layering of the present invention, described roadbed is sandwich construction, every layer is all surrounded by roadbed waterproof enhancement layer entirely in the mode sealing, and stack formation roadbed is whole.
Further, between described waterproof enhancement layer and roadbed and between the waterproof enhancement layer of the roadbed the superiors and roadbed upper strata, there is larger friction factor;
Further, also have successively from down to up bed course and the basic unit as roadbed upper strata on roadbed, fluid-tight waterproof shock-absorption functional layer is set between basic unit and bed course, the equal natural separation of waterproof shock-absorption functional layer and basic unit and bed course also has larger friction factor;
Further, the roadbed integral body that multilayer road structure forms is surrounded by the outer enhancement layer of roadbed entirely;
Further, the outer enhancement layer of described roadbed waterproof enhancement layer and roadbed be two cloth one film composite water-proof geomembranes, through compiling composite strengthening waterproof composite geo-membrane or high-strength composite water-proof geomembrane;
Further, basic unit is surrounded by waterproof shock-absorption functional layer entirely in the mode of sealing, and described waterproof shock-absorption functional layer is composite water-proof geomembrane, composite plastic woven cloth or plastic sheeting;
Further, in described basic unit, be equipped with bituminous concrete composite cover, portland cement concrete surface layer, roller compacted concrete surface layer, modified concrete surface layer or fibrous concrete surface layer; Described basic unit is flexbile base, semi-rigid type base or rigid base; Described bed course is permeable bed course.
The job practices that the invention also discloses the pavement structure of the full bag of a kind of roadbed layering, comprises the following steps:
A. the base waterproof enhancement layer of first paving the way before making first floor roadbed, and be positioned at the reserved roadbed waterproof enhancement layer material of road width direction, fill first floor roadbed compacting, by reserved roadbed waterproof enhancement layer material, first floor roadbed is wrapped entirely, seam crossing overlap joint sealed engagement; On the roadbed waterproof enhancement layer of first floor roadbed, continue to lay second layer roadbed waterproof enhancement layer and fill second layer roadbed and compacting, by reserved second layer roadbed waterproof enhancement layer material, second layer roadbed is wrapped entirely to seam crossing overlap joint sealed engagement; By that analogy, until laid all roadbeds;
B. roadbed paving upper strata.
Further, in step a, before laying the roadbed waterproof enhancement layer of first floor roadbed, the outer enhancement layer of first roadbed paving is also positioned at the outer enhancement layer material of the reserved roadbed of road width direction, after all roadbed is laid, by the outer enhancement layer material of reserved roadbed, whole roadbeds are wrapped entirely to seam crossing overlap joint sealed engagement;
In step b, comprising:
Making bed course on b1. the superiors roadbed waterproof enhancement layer;
B2., after treating the complete moulding of setting cushion, the waterproof shock-absorption functional layer of paving the way on bed course, lays basic unit;
Or, after treating the complete moulding of setting cushion, in bed course upper berth waterproof shock-absorption functional layer, and be positioned at the reserved waterproof shock-absorption functional layer material of road width direction, lay basic unit, by reserved waterproof shock-absorption functional layer material, by the Quan Bao of basic unit, seam crossing overlap joint is sealed engagement also;
Making surface layer in b3. basic unit, forms complete pavement structure.
Beneficial effect of the present invention is: the pavement structure of the full bag of roadbed layering of the present invention, roadbed adopts the sealed waterproof with sufficient intensity (having booster action) and the full bag of impermeable material to strengthen structure, both cut off water on the ground, the water sources such as underground water are from various approach, all directions (especially from roadbed side) enter roadbed, also prevented the evaporation of subgrade moisture, migration is scattered and disappeared, subgrade moisture content is controlled in stable under construction optimum moisture content, efficiently solve because of subgrade moisture content increase or reduce to cause its intensity, the various subgrade and pavement breakoff phenomenons that bearing capacity and stability decreases are brought, simultaneously, also subgrade defect and the destruction that cause winter because of underground water frost heave will significantly be reduced, can also stop surface water to enter roadbed by permeable bed course completely, avoid the roadbed damage by water and the mud pumping phenomenon that cause thus, make pavement structure monolithic stability, block roadbed fine grained soils or particle simultaneously and brought into permeable bed course by underground water, avoid the loss of roadbed fine grained soils or particle, stop the pavement depression that causes because of Problems On Subgrade, certainly, also just avoided the hole of roadbed fine grained soils or the permeable bed course of Particle Blocking, the roadbed of this structure has good compliance to roadbed material, particularly for some, to the soil property of water sensitive or rock material, can be suitable for, such as expansive soil, collapsible soil and tuff etc.Like this, while building road in water sensitive soil property rock matter area, can sufficiently and reasonably utilize local material, reduce construction costs raising, energy consumption and the environmental disruption etc. that transhipment etc. causes that connect material of excavation spoir, embankment.
Simultaneously, because roadbed adopts monolithic overlaying structure, there is " strengthening completely continuously strengthening " and " confinement effect " effect, significantly improve bearing capacity, stability and the shock resistance of subgrade and pavement, can solve well subgrade and pavement uneven subsidence, the roadbed of high filling section can be formed compared with steep side slope and keep stable, reduce the floor space of roadbed construction, thoroughly avoid the formation of the potential slide plane of roadbed to be connected with connecting, extend the life cycle of road integral body simultaneously; Simultaneously, during normal use, waterproof enhancement layer also makes the force-bearing situation tool of roadbed own improve significantly, simultaneously, road both sides, due to the separation of waterproof enhancement layer, do not have the adhesion of prior art, just roadbed integral body are independently stablized yet, when being subject to load and impact, vibrations, can coordinate better stress deformation, increase the ability withstanding shocks of roadbed so that road construction.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, pavement structure and the job practices thereof of the full bag of roadbed layering of the present invention are described further.
Fig. 1 is structural representation of the present invention;
Fig. 2 is the overlap joint syndeton of roadbed waterproof enhancement layer of the present invention and waterproof shock-absorption functional layer.
The specific embodiment
Fig. 1 is structural representation of the present invention, and Fig. 2 is the overlap joint syndeton of roadbed waterproof enhancement layer of the present invention and waterproof shock-absorption functional layer; As shown in the figure: the pavement structure of the full bag of roadbed layering of the present invention, comprise successively from top to bottom surface layer 4, basic unit 3, bed course 2 and roadbed 1, described roadbed 1 is sandwich construction, and every layer is all surrounded by roadbed waterproof enhancement layer 6 entirely in the mode sealing, and stack forms roadbed 1 integral body; As shown in the figure, form the independently sandwich construction in perception, relatively independent between layers, more can cooperative bearing for larger external force, avoid differential settlement; Meanwhile, layering is surrounded by the superposing type roadbed that roadbed waterproof enhancement layer forms entirely, and whole water content is controlled better, strengthens enhancing and confinement effect ability more remarkable, and subgrade rating and stability can promote by a larger margin; Form sandwich construction, under the prerequisite of ability that guarantees roadbed 1 integral waterproofing water conservation, be beneficial to cooperative bearing, the effect of opposing external force, the roadbed waterproof enhancement layer 6 of interlayer forms totally continuous enhancement Layer between base course, when strengthening subgrade rating and resistance capacity to deformation, the formation of having blocked potential slide plane is connected with connecting.
In the present embodiment, larger friction factor between described waterproof enhancement layer 6 and roadbed 1 and between the waterproof enhancement layer of roadbed 1 the superiors and roadbed upper strata; Larger friction factor refers to when being subject to having the external force that makes the two relative sliding, can produce larger stiction, avoids slippage; Waterproof enhancement layer 6 forms stronger effect of contraction at each layer of roadbed, can significantly strengthen bearing capacity, stability and the durability of roadbed, make roadbed uniform stressed, reduce the Non-uniform Settlement distortion of conventional roadbed, and can make to produce between layers synergy the chain destruction of avoiding local sedimentation to cause; And when routine use, this structure is between layers beneficial to the raising of roadbed bulk strength, extend the application life of roadbed; As shown in Figure 1; Form the absolute construction of multilayer, under the prerequisite of ability that guarantees roadbed 1 integral waterproofing water conservation, be beneficial to cooperative bearing, the effect of opposing external force, make to form between each layer of roadbed totally continuous reinforcement, when strengthening subgrade rating and resistance capacity to deformation, the formation of having blocked potential slide plane is connected with connecting.
In the present embodiment, on roadbed, also there is successively from down to up bed course 2 and the basic unit 3 as roadbed 1 upper strata, fluid-tight waterproof shock-absorption functional layer 5 is set between basic unit 3 and bed course 2, and waterproof shock-absorption functional layer 5 is with basic unit 3 and the equal natural separation of bed course 2 and have larger friction factor; Changed the architectural feature fitting tightly between each functional layer in prior art, make direct between waterproofing course and basic unit 3 and bed course 2 and between basic unit and bed course contact the distortion making between each functional layer influence each other drop to minimum; The existence of larger friction factor, is beneficial to and guarantees pavement structure globality and harmony.
In the present embodiment, the roadbed integral body that multilayer road structure forms is surrounded by the outer enhancement layer 7 of roadbed entirely; Roadbed layering is wrapped after stack entirely, in outermost, wraps the outer enhancement layer 7 of one deck roadbed again, to retrain each inner layering roadbed, further increases structural stability; The outer enhancement layer 7 of roadbed can be for two cloth one film composite water-proof geomembranes, through compiling composite strengthening waterproof composite geo-membrane or high-strength composite water-proof geomembrane etc., have the film of stiffening effect, all can realize goal of the invention.
In the present embodiment, the outer enhancement layer of described roadbed waterproof enhancement layer 6 and roadbed for be two cloth one film composite water-proof geomembranes, through volume composite strengthening waterproof composite geo-membrane or high-strength composite water-proof geomembrane; The present embodiment is two cloth one film composite water-proof geomembranes; Not only there is good waterproof water conservation effect, can also increase whole interfacial friction adhesive power, thereby improve roadbed confinement effect ability, to guarantee globality, bearing capacity and the application life of pavement structure; According to different pavement behavior and environment for use, adopt the waterproof composite geo-membrane of different unit masses and tensile strength; Such as subgrade in swelling soil zone, salt-soda soil roadbed or heavily loaded roadbed, should adopt the roadbed waterproof enhancement layer that tensile strength is larger; The present embodiment adopts through compiling composite strengthening waterproof (oozing) composite geo-membrane, and mass area ratio 400g/m2～600g/m2, through broadwise tensile strength 25kN/m～80kN/m.This composite geo-membrane has high-tensile, low elongation, vertical lateral deformation is even, puncture-resistant intensity is high, friction factor is large, adhesive power is strong especially, the corrosion of acid and alkali resistance, salt, the good characteristics such as anti-aging good endurance, water proofing property are strong, not only can prevent increase and the loss of subgrade moisture, because it has high tensile strength and friction adhesive power, confinement effect effect is obvious, bearing capacity, stability and the durability that can also significantly strengthen roadbed, make roadbed uniform stressed, reduces the Non-uniform Settlement distortion of conventional roadbed; Adopt the full packet form of layering constructing roadbed, guaranteed friction adhesive power between layers, simultaneously, the booster action performance of the full parcel of layering obviously, can under the prerequisite that guarantees subgrade stability, form steeper roadbed side slope, at route, pass through area, farmland and be conducive to reduce occupying valuable cultivated area.
The present embodiment Zhong， basic unit 3 is surrounded by waterproof shock-absorption functional layer 5 entirely in the mode of sealing, and described waterproof shock-absorption functional layer 5 is composite water-proof geomembrane, composite plastic woven cloth or plastic sheeting; The present embodiment is two cloth one film composite water-proof geomembrane structures; Certainly, the whole subcontracting mode of basic unit 3 can adopt whole full bag or the full bag of the layering structure of stack again, all can realize goal of the invention; Because basic unit adopts full pack arrangement, can also make basic unit form integral body or monolithic overlaying structure, reduce basic unit and occur differential settlement and be subject to impact force making road overall coordination stressed, extend the life cycle of road integral body; Meanwhile, normally use the force-bearing situation tool of Shi，Ye Shi basic unit own to improve significantly, the local disease that can effectively avoid differential settlement to cause, the ability withstanding shocks of increase basic unit so that road construction.
In the present embodiment, in described basic unit 3, be equipped with surface layer 4, surface layer 4 is bituminous concrete composite cover, portland cement concrete surface layer, roller compacted concrete surface layer, modified concrete surface layer or fibrous concrete surface layer; Described basic unit is flexbile base, semi-rigid type base or rigid base; Described bed course is permeable bed course, can adopt organic sarking, inorganic material bed course or organic material to be combined the conventional permeable cushion layer structure such as bed course with inorganic material; In fact, when Zhong，Dang of the present invention basic unit does not adopt the hermetically-sealed construction of full bag, can adopt asphalt pavement structure; Or, when basic unit adopts the hermetically-sealed construction of full bag, add again thereon and spread after basic unit's (comprising permeable upper basic unit), also can adopt asphalt pavement structure.
The job practices that the invention also discloses the pavement structure of the full bag of a kind of roadbed layering, comprises the following steps:
A. the base waterproof enhancement layer of first paving the way before making first floor roadbed, and be positioned at the reserved roadbed waterproof enhancement layer material of road width direction, fill first floor roadbed compacting, by reserved roadbed waterproof enhancement layer material, first floor roadbed is wrapped entirely, seam crossing overlap joint sealed engagement; On the roadbed waterproof enhancement layer of first floor roadbed, continue to lay second layer roadbed waterproof enhancement layer and fill second layer roadbed and compacting, by reserved second layer roadbed waterproof enhancement layer material, second layer roadbed is wrapped entirely to seam crossing overlap joint sealed engagement; By that analogy, until laid all roadbeds;
B. roadbed paving upper strata.
In the present embodiment, in step a, before laying the roadbed waterproof enhancement layer of first floor roadbed, the outer enhancement layer of first roadbed paving is also positioned at the outer enhancement layer material of the reserved roadbed of road width direction, after all roadbed is laid, by the outer enhancement layer material of reserved roadbed, whole roadbeds are wrapped entirely to seam crossing overlap joint sealed engagement;
In step b, comprising:
Making bed course on b1. the superiors roadbed waterproof enhancement layer;
B2., after treating the complete moulding of setting cushion, the waterproof shock-absorption functional layer of paving the way on bed course, lays basic unit;
Or, after treating the complete moulding of setting cushion, in bed course upper berth waterproof shock-absorption functional layer, and be positioned at the reserved waterproof shock-absorption functional layer material of road width direction, lay basic unit, by reserved waterproof shock-absorption functional layer material, by the Quan Bao of basic unit, seam crossing overlap joint is sealed engagement also;
Making surface layer in b3. basic unit, forms complete pavement structure.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. a pavement structure for the full bag of roadbed layering, comprises roadbed, it is characterized in that: described roadbed is sandwich construction, and every layer is all surrounded by roadbed waterproof enhancement layer entirely in the mode sealing, and stack formation roadbed is whole.
2. the pavement structure of the full bag of roadbed layering according to claim 1, is characterized in that: between described waterproof enhancement layer and roadbed and between the waterproof enhancement layer of the roadbed the superiors and roadbed upper strata, have larger friction factor.
3. the pavement structure that roadbed layering according to claim 2 is wrapped entirely, it is characterized in that: on roadbed, also there is successively from down to up bed course and the basic unit as roadbed upper strata, fluid-tight waterproof shock-absorption functional layer is set between basic unit and bed course, and the equal natural separation of waterproof shock-absorption functional layer and basic unit and bed course also has larger friction factor.
4. the pavement structure of the full bag of roadbed layering according to claim 3, is characterized in that: the roadbed integral body that multilayer road structure forms is surrounded by the outer enhancement layer of roadbed entirely.
5. the pavement structure of the full bag of roadbed layering according to claim 4, is characterized in that: the outer enhancement layer of described roadbed waterproof enhancement layer and roadbed is two cloth one film composite water-proof geomembranes, through compiling composite strengthening waterproof composite geo-membrane or high-strength composite water-proof geomembrane.
6. the pavement structure of the full bag of roadbed layering according to claim 5, is characterized in that: basic unit is surrounded by waterproof shock-absorption functional layer entirely in the mode of sealing, and described waterproof shock-absorption functional layer is composite water-proof geomembrane, composite plastic woven cloth or plastic sheeting.
7. the pavement structure of the full bag of roadbed layering according to claim 6, is characterized in that: in described basic unit, be equipped with bituminous concrete composite cover, portland cement concrete surface layer, roller compacted concrete surface layer, modified concrete surface layer or fibrous concrete surface layer; Described basic unit is flexbile base, semi-rigid type base or rigid base; Described bed course is permeable bed course.
8. a job practices for the pavement structure of the full bag of roadbed layering, is characterized in that: comprise the following steps:
A. the base waterproof enhancement layer of first paving the way before making first floor roadbed, and be positioned at the reserved roadbed waterproof enhancement layer material of road width direction, fill first floor roadbed compacting, by reserved roadbed waterproof enhancement layer material, first floor roadbed is wrapped entirely, seam crossing overlap joint sealed engagement; On the roadbed waterproof enhancement layer of first floor roadbed, continue to lay second layer roadbed waterproof enhancement layer and fill second layer roadbed and compacting, by reserved second layer roadbed waterproof enhancement layer material, second layer roadbed is wrapped entirely to seam crossing overlap joint sealed engagement; By that analogy, until laid all roadbeds;
B. roadbed paving upper strata.
9. the pavement structure that roadbed layering according to claim 8 is wrapped entirely, it is characterized in that: in step a, before laying the roadbed waterproof enhancement layer of first floor roadbed, the outer enhancement layer of first roadbed paving is also positioned at the outer enhancement layer material of the reserved roadbed of road width direction, after all roadbed is laid, by the outer enhancement layer material of reserved roadbed, whole roadbeds are wrapped entirely to seam crossing overlap joint sealed engagement;
In step b, comprising:
Making bed course on b1. the superiors roadbed waterproof enhancement layer;
B2., after treating the complete moulding of setting cushion, the waterproof shock-absorption functional layer of paving the way on bed course, lays basic unit;
Or, after treating the complete moulding of setting cushion, in bed course upper berth waterproof shock-absorption functional layer, and be positioned at the reserved waterproof shock-absorption functional layer material of road width direction, lay basic unit, by reserved waterproof shock-absorption functional layer material, by the Quan Bao of basic unit, seam crossing overlap joint is sealed engagement also;
Making surface layer in b3. basic unit, forms complete pavement structure.
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| CN103556558B (en) | 2015-06-24 |
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