CN205617176U - Roadbed structure of whole balanced cooling cold -storage - Google Patents
Roadbed structure of whole balanced cooling cold -storage Download PDFInfo
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- CN205617176U CN205617176U CN201620205073.9U CN201620205073U CN205617176U CN 205617176 U CN205617176 U CN 205617176U CN 201620205073 U CN201620205073 U CN 201620205073U CN 205617176 U CN205617176 U CN 205617176U
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Abstract
The utility model relates to a roadbed structure of whole balanced cooling cold -storage, this structure include lay in the road embankment perpendicular highway trend and with the communicating ventilation pipe in the external world. Automatic control by temperature change air door is installed at the one end or the both ends of ventilation pipe, insulation material layer I has been laid to the top of ventilation pipe, the inside insulation material layer II of burying underground in both sides of embankment, big porous medium layer has been laid to the embankment side slope. The utility model discloses under can realizing frozen soil highway condition, the road bed is wholly lowered the temperature, the even and steady special technical requirement who lowers the temperature, the effectively secondary disease of prevention and control road bed production.
Description
Technical field
The utility model relates to frozen soil engineering technical field, particularly relates to the road structure of a kind of overall equilibrium cooling cold-storage.
Background technology
Frozen soil is that a kind of temperature is less than 0 DEG C and the Tu Yan containing ice, can be divided into seasonal frozen ground (first quarter moon is to the several months) and ever-frozen ground (more than a year) by the length of frozen soil retention time, China Qinghai-Tibet Platean is the most wide region of High aititude low latitudes permafrost distribution in the world.Can relatively melt soil due to its character of existence of ice in frozen soil and complicated and essence change occurs, and in Permafrost Area, by long-term evolution, development and change, more can form thickness and reach several meters, even tens meters, each Thick Underground Ice having form.With change, the impact of Human dried bloodstains of climatic environment, cause frozen soil and ground ice degenerate and melt, thus cause the generation of various engineering project disaster, material impact is produced to various Important Project structural stability.
Qinghai-Tibet Railway that China builds, Xinjiang-Tibet highway, West Line of South-North Water Transfer Project all suffer from high temperature (i.e. temperature is close to the ever-frozen ground of 0 DEG C), hight-ice-content permafrost (i.e. volume ice content substantially exceeds the ever-frozen ground of 30%), weather turn warm ever-frozen ground constantly many difficult problems such as degeneration.How to resolve roadbed and basis is affected caused engineering disease by ever-frozen ground, it is ensured that roadbed and basis are steady in a long-term, guarantee that engineering construction safe operation also just becomes key scientific problems urgently to be resolved hurrily.
Highway Frozen soil problems compared with railway is more prominent.There are some researches show (Yu Qihao etc. key issue research built by China's Permafrost Area highway. Chinese science (technological sciences), 2014,44(4): 425 ~ 432), in terms of heat transfer, mainly pass through the domatic heat absorption of embankment filled soil due to railway, and the heat absorbing is concentrated mainly on the outside left of embankment filled soil bottom surface, it is easy to outwards dispel the heat.But for highway, strong endothermic due to dark-coloured pavement, and bituminous paving water proof, stop moisture evaporative heat loss impact, the get down the highway overall heat absorption intensity of roadbed of the same terms is made to be more than 3 times of railway, and the hot-fluid being absorbed by road surface focuses primarily upon the centre of embankment filled soil bottom surface, it is difficult to the heat radiation of frozen soil around.Meanwhile, highway is compared with common road, and when highway subgrade width increase about 1 times, the heat absorption intensity of embankment bottom surface increases by 0.6 times, thus produces " the heat build-up effect " becoming apparent from, and causes frozen soil more quickly to be degenerated.In the face of higher technical standard, the heat effect between highway and frozen soil is more significantly, and building highway in Permafrost Area will be in the face of more prominent Frozen soil problems and build technical barrier.
More effectively protect the engineering measure of ever-frozen ground by taking some, be to solve Frozen Soil Engineering Problems, guarantee frozen soil engineering stability, and the cold district of protection fragility simultaneously frozen soil, the unique channel of ecological environment harmony.In qinghai-tibet railway engineering practice; Chinese science worker's novelty proposes the positive protection of permafrost principle that " cooling roadbed " is means; i.e. cooling subgrade soil; reduce the heat of incoming foundation soil body; increase the mode of the cold reserves of foundation soil body; by reducing frozen earth roadbed temperature, reach to maintain frozen earth roadbed purpose steady in a long-term.And thus system has carried out engineering practice, successively systematic difference research is carried out to engineering measures such as block-stone embankment, U-shaped roadbed, rock revetment, hollow block bank protection, ventilation pipe foundation, hot pin (stake), sunshading boards (canopy), and acquire a great achievement, it is ensured that Qinghai-Tibet Railway steady in a long-term.
But owing to railway is different from highway, express highway roadbed structure and condition, result in the essential distinction of the aspects such as roadbed diabatic process, value feature, heat spatial distribution.In the face of highway, the higher technology of express highway roadbed ground temperature regulation and control require and standard, the successful experience acquired in Qinghai-Tibet Railway, it is difficult to directly obtain application in Qinghai-Tibet Highway and Qinghai-Tibet highway, or meet engineering practice requirement.
Published patent " composite temperature controlled ventilation roadbed " (patent No.: ZL200410002135.8) is mainly for Qinghai-Tibet Railway roadbed, result of study shows the advance of this kind of measure, validity (Yu Qihao, Cheng Guodong, Niu Fujun. the analyzing of applying effects of auto-temperature-controlled ventilation roadbed. Chinese Journal of Rock Mechanics and Engineering, 2004,23 (24): 4221-4228).But, under the conditions of highway subgrade strong endothermic, but there is prominent engineering problem in this kind of design structure.By the application in the high-grade experiment and demonstration full-scale test engineering of Qinghai-Tibet Platean Qinghai-Tibet, visible (Fig. 1) by field data, after although this technology is implemented, closedown due to warm season ventilation duct, and the heat-blocking action of insulation material, effectively weaken the impact of warm season heat transfer, the cold energy saving storage in winter；Thus greatly improve 0 DEG C of isopleth height, even close to former natural surface position, effectively reduce frozen soils temperature simultaneously.But, owing to the insulation material arranging is only the unidirectional setting of ventilation duct end face, one-way hot-resistant, the impact of the domatic lateral endothermic process of embankment is notable.While overall 0 DEG C of isopleth significantly lifting, owing to the thermal etching effect domatic by warm season, roadbed is lateral is affected and superposition, result in roadbed internal near 0 DEG C, roadbed side slope position line rise steeply, the formation of steep bank form, its drop is even up to more than 2m.And the frost heave of the soil body rises, thaw subsidence, not only can cause the difference of soil body vertical deviation, also can cause the difference of frozen crust and melt layer soil body mechanical property and response simultaneously, and the stress concentration between different parts, the changing of the relative positions and movement, the generation of the series engineering diseases such as induction crevice of roadbed in embankment body.Just because of the existence of this kind of reason, in the high-grade highway Test and pilot project of Qinghai-Tibet, in the full-scale test engineering of this kind of technology, roadbed generation continuous print longitudinal cracking, embankment cracking width about reaches 2cm, and presents the trend of constantly increase.With the intrusion further of Atmospheric precipitation, the generation of the secondary engineering disease such as differential frost heave or thaw collapse can be further resulted in, have a strong impact on frozen earth roadbed long-time stability.
Additionally, patent " convection current-ventilation combined subgrade " (patent No.: 200820029281.3) is although have employed ventilation duct and pitched work complex method, but summer, heat can cause the rising of roadbed bottom frozen soils temperature by ventilation duct, road bed rapidly to the transmission of road intrinsic silicon.Patent " composite road bed based on XPS warming plate and ventilation duct " (patent No.: ZL201420016447.3) is though have employed ventilation duct and insulation material, but heat in summer cannot be got rid of equally directly quickly transmit from ventilation duct to roadbed bottom, making bottom frozen soils temperature raise, thaw depth is deepened.Especially under the conditions of the building highway of Permafrost Area, these measures are all difficult to meet requirement of engineering.
Therefore, in the face of the problems referred to above, how effectively to reach the regulation and control of the ground temperature to highway, highway and require, be all how to ensure highway crucial problem urgently to be resolved hurrily steadily in the long term in Qinghai-Tibet under the influence of current climate.
Utility model content
Technical problem to be solved in the utility model is to provide the road structure of the entirety equilibrium cooling cold-storage that the secondary disease of a kind of effective prevention and control roadbed produces.
For solving the problems referred to above, the road structure of a kind of overall equilibrium cooling cold-storage described in the utility model, it is characterised in that: this structure includes setting, at road embankment middle berth, the ventilation duct that vertical highway moves towards and communicates with the external world；The one or both ends of described ventilation duct are provided with automatic temperature-controlled air door；Described ventilation duct overlaid with adiabator layer I；Adiabator layer II is buried underground inside the both sides of described embankment；Described side slope of embankment is equipped with macrovoid dielectric layer.
Burying described adiabator layer II underground and widening position in described embankment bottom, the value added of this embankment lower width is 0.0 ~ 2.0m.
The height apart from described ventilation duct top for the described adiabator layer I is 0 ~ 50cm.
Described macrovoid dielectric layer is domatic with described embankment parallel, and its thickness is 0.0 ~ 1.5m, height to described adiabator layer more than I 10 ~ 50cm.
The thickness of described adiabator layer I and described adiabator layer II is 10 ~ 30cm.
The utility model compared with prior art has the advantage that
1st, the particular/special requirement of Permafrost Area highway ground temperature regulation and control is effectively reached.
First, it by the application of aggregate measures, is prevented effectively from the impact of warm season domatic heat erosion process, while avoiding that winter, cold energy scattered and disappeared, improve the entirety cooling usefulness of this measure further；Secondly, effectively eliminate the steep bank of 0 DEG C of isopleth of warm season, the appearance of step form, reach the purpose of Temperature Field ride comfort, stationarity；3rd, 0 DEG C of isopleth lifting range is extended to whole embankment filled soil corresponding position.Therefore, under the conditions of the utility model can realize frozen soil highway, roadbed special technical requirement overall, that uniformly and steadily lower the temperature.
2nd, it is prevented effectively from the generation of secondary engineering disease.
Due to the very big improvement of above-mentioned 0 DEG C of isopleth and overall Temperature Field, the corresponding frozen soil underlying strength in embankment bottom is all strengthened；Otherness between roadbed different parts, stress concentration phenomenon obtain very big alleviation；Potential roadbed internal slide face is effectively eliminated.Due to these favorable factor comprehensive functions, frozen earth roadbed engineering stability is thus fundamentally improved.
3rd, the reinforcement that frozen earth roadbed stability obtains.
The reduction of subgrade soil thaw depth, effective preventing and treating of the diseases such as crevice of roadbed, avoid Atmospheric precipitation and penetrate into the change causing subgrade soil mechanical property along crack, effectively stop the impact on subgrade stability for the frozen-thaw process, thus further increase frozen earth roadbed stability.
4th, the optimization of engineering cost and structure, the reduction of cost.
The optimization by slope structure for the utility model, can save the half of conventional domatic employing engineering material so that limited resource obtains maximum and utilizes.Put into although insulation material appropriateness increases engineering, but overall accounting is little.While integrated engineering puts into and decreases, engineering cost performance is increased dramatically, and obtains optimal engineering effort.
5th, environment is protected.
Use the utility model can improve the stability on basis, decrease engineering maintenance and the expense of later stage engineering disease improvement, under the extremely fragile natural environmental condition in Qinghai-Tibet Platean, indirectly serve the good protection effect to environment.
Brief description
Below in conjunction with the accompanying drawings detailed description of the invention of the present utility model is described in further detail.
Fig. 1 is the automatic temperature-controlled roadbed of Qinghai-Tibet high-grade highway experiment and demonstration entity project (in October, 2014 ground temperature monitoring result).
Fig. 2 is structural representation of the present utility model.
Fig. 3 is the utility model and automatic temperature-controlled roadbed ground temperature monitoring result comparison diagram.
In figure: 1 adiabator layer I；2 macrovoid dielectric layers；3 adiabator layers II；4 ventilation ducts；5 automatic temperature-controlled air doors；6 embankments.
Detailed description of the invention
As in figure 2 it is shown, the road structure of a kind of overall equilibrium cooling cold-storage, this structure includes laying the ventilation duct 4 that vertical highway moves towards and communicates with the external world in road embankment 6.The one or both ends of ventilation duct 4 are provided with automatic temperature-controlled air door 5；Ventilation duct 4 overlaid with adiabator layer I 1；Adiabator layer II 3 is buried underground inside the both sides of embankment 6；Embankment 6 side slope is equipped with macrovoid dielectric layer 2.
Wherein:
Burying described adiabator layer II 3 underground and widening position in embankment 6 bottom, the value added of this embankment 6 lower width is 0.0 ~ 2.0m.
The height at adiabator layer I 1 Distance Ventilation pipe 4 top is 0 ~ 50cm.
Macrovoid dielectric layer 2 is domatic with embankment 6 parallel, and its thickness is 0.0 ~ 1.5m, height to adiabator layer more than I 1 10 ~ 50cm.
Adiabator layer I 1 and adiabator layer II 3 are polystyrene, polyurethane, foam glass, the one in injection polystyrene, and its thickness is 10 ~ 30cm.
Macrovoid dielectric layer 2 is block stone, one or both and combination of the above in concrete block, concrete hollow block.
Automatic temperature-controlled air door 5 uses Application No. 03114640.6, the air door of 03114641.4, when this air door is below or above design temperature according to outside air temperature, automatically turns on or closes air door.
The principle that the utility model usefulness realizes:
First, in the winter time or when night, ambient temperature was relatively low, embankment 6 starts to ventilate, and under heat convection effect effect, reduces rapidly the soil body, frozen soils temperature with the ventilation duct 4 of automatic temperature-controlled air door 5 two ends or side.And when warm season or daylight environment temperature are higher, the closedown of automatic temperature-controlled air door 5, effectively stop the forfeiture of heat convection, the intrusion of heat energy or embankment 6 cold energy of embankment 6；Secondly, ventilation duct 4 top adiabator layer I 1 can stop the heat from the transmission of pitch blackness road surface largely；3rd, high-grade highway embankment is higher, and the heat absorption of its roomy side slope of embankment is also the important sources of roadbed heat, and the domatic cooling measure of cold-storage of the present utility model is a kind of highly efficient domatic regulation measure, can effectively stop domatic heat absorption, and reduce domatic temperature；Finally, by the comprehensive regulation effect of different aspect, while effectively reaching reduction uniform, smooth frozen earth roadbed temperature objectives, overall usefulness of lowering the temperature also is made to improve further.
The utility model is specifically appliedExample 1:
(1) the thickness in compaction in layers is, on the roadbed 6 of 1.0m bankets, to place the ventilation duct 4 of a diameter of 40cm.
(2) ventilation duct 4 two ends are provided with automatic temperature-controlled air door 5, and the control temperature of the opening and closing that air door sets is as 0 DEG C.Temperature is automatically switched off higher than 0 DEG C of air door, lower wind door automatically turn on.
(3) after the compacting filling soil of 30cm thickness is laid on ventilation duct 4 top, the injection Polystyrene heat insulation material layer I 1 of laying depth 10cm.Simultaneously at both sides embankment domatic laying depth 10cm Polystyrene heat insulation material layer II 3, form enclosed construction with the adiabator layer I 1 at ventilation duct 4 top.
(4) carry out embankment 6 to banket and fill, widen.Widen the domatic horizontal breadth in rear roadbed both sides and be 50cm.
(5), at domatic laying macrovoid dielectric layer 2, parallel domatic, the thickness of macrovoid dielectric layer 2 is 30cm, and the height beyond ventilation duct 4 end face adiabator layer I 1 is 20cm.
(6) embankment 6 completes follow-up engineering construction according to typical specification.
For verifying the usefulness of this utility model, in conjunction with on-site actual situations, numerical simulation calculating, and the field measured data contrast with original technology (compound temperature control roadbed technology) are carried out to this kind of new structure in indoor.By Comparative result it will be seen that the utility model has prominent advance, effectively solve a frozen soil engineering difficult problem.Concrete manifestation is in the following areas:
(1) it is effectively improved original Temperature Field situation, radical change roadbed stress state, effectively solve highway and build a difficult problem.
By Fig. 3 it can be seen that, first, 0 DEG C of curve of ground temperature of the present utility model (" the utility model " curve in figure) is completely eliminated prior art (aforementioned existing " composite temperature controlled ventilation roadbed " technology, " prior art " curve in figure) rise steeply, the appearance of steep bank phenomenon, 0 DEG C of curve of ground temperature have been converted into mild excessively；Secondly, the width of 0 DEG C of temperature line end face is effectively widened, and 0 DEG C of corner position, also by position, original corresponding road surface, moves on to outward near toe position.Correspondingly, roadbed key position stress, Temperature Field obtain radical change, and all frozen soil layers of embankment loading are undertaken.Overall, homogeneous temperature field required by frozen soil highway are effectively realized.
(2) effectively eliminate engineering disease occurrence cause.
Due to the increase of frozen soil supporting course part, the phenomenon out of stock of roadbed stress field, the elimination of stress concentration phenomenon, in terms of roadbed stress field, eliminate the disease occurrence causes such as roadbed longitudinal cracking, differential settlement.Due to 0 DEG C of curve of ground temperature outside slowly excessively, and extend to beyond toe, effectively by roadbed and Atmospheric precipitation around is got rid of beyond roadbed, in terms of moisture, thus eliminate engineering disease further the reason that occur.
(3) more prominent cooling usefulness.
By application of the present utility model, 0 DEG C of isopleth of roadbed bottom warm season is significantly higher than existing compound temperature control road structure, the artificial frozen soil upper limit about 0.2m in the internal lifting of highway subgrade, and significantly reduce the temperature of roadbed bottom frozen soil, as shown in Figure 3, after using overall cooling road structure, roadbed bottom occurs in that-1.5 DEG C of ground temperature isopleth, lower frozen soils temperature fall advantageously ensures that calorifics and the mechanical stability of roadbed, preferably resists engineering activity and the climate change impact on engineering stability.
(4) can tackle more severe natural environment, guarantee the steady in a long-term of roadbed.
Due to being substantially improved of index of the every technology of the utility model, being calculated by simulation, the utility model can tackle the situation of change that future 50 years Environment of Qinghai-Tibet Plateau temperature raises 2.6 DEG C completely.Result of calculation is shown under FUTURE ENVIRONMENT change condition, 0 DEG C of temperature isopleth, and other temperature value Temperature Field of Permafrosts remain stable substantially, may insure that the steady in a long-term of roadbed completely.
Claims (5)
1. the road structure of an overall equilibrium cooling cold-storage, it is characterised in that: this structure includes laying in road embankment (6) ventilation duct (4) that vertical highway moves towards and communicates with the external world；The one or both ends of described ventilation duct (4) are provided with automatic temperature-controlled air door (5)；Described ventilation duct (4) overlaid with adiabator layer I (1)；Adiabator layer II (3) is buried underground inside the both sides of described embankment (6)；Described embankment (6) side slope is equipped with macrovoid dielectric layer (2).
2. the road structure of a kind of overall equilibrium cooling cold-storage as claimed in claim 1, it is characterised in that: burying described adiabator layer II (3) underground and widening position in described embankment (6) bottom, the value added of this embankment (6) lower width is 0.0 ~ 2.0m.
3. the road structure of a kind of overall equilibrium cooling cold-storage as claimed in claim 1, it is characterised in that: the height apart from described ventilation duct (4) top for the described adiabator layer I (1) is 0 ~ 50cm.
4. the road structure of a kind of overall equilibrium cooling cold-storage as claimed in claim 1, it is characterized in that: described macrovoid dielectric layer (2) is domatic parallel with described embankment (6), its thickness is 0.0 ~ 1.5m, height to described adiabator layer I more than (1) 10 ~ 50cm.
5. the road structure of a kind of overall equilibrium cooling cold-storage as claimed in claim 1, it is characterised in that: the thickness of described adiabator layer I (1) and described adiabator layer II (3) is 10 ~ 30cm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107201709A (en) * | 2016-03-17 | 2017-09-26 | 中国科学院寒区旱区环境与工程研究所 | A kind of roadbed of overall balanced cooling cold-storage |
| CN110565465A (en) * | 2019-08-20 | 2019-12-13 | 东南大学 | Phase-change temperature-control frost heaving resistant roadbed structure and implementation method thereof |
| CN114960321A (en) * | 2022-07-04 | 2022-08-30 | 吉林大学 | Pi-shaped freeze-thaw resistant roadbed structure and construction method thereof |
| RU2790448C1 (en) * | 2022-06-06 | 2023-02-21 | Федеральное государственное автономное образовательное учреждение высшего образования "Сибирский федеральный университет" | Coastal protection structure of frozen type |
-
2016
- 2016-03-17 CN CN201620205073.9U patent/CN205617176U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107201709A (en) * | 2016-03-17 | 2017-09-26 | 中国科学院寒区旱区环境与工程研究所 | A kind of roadbed of overall balanced cooling cold-storage |
| CN110565465A (en) * | 2019-08-20 | 2019-12-13 | 东南大学 | Phase-change temperature-control frost heaving resistant roadbed structure and implementation method thereof |
| RU2790448C1 (en) * | 2022-06-06 | 2023-02-21 | Федеральное государственное автономное образовательное учреждение высшего образования "Сибирский федеральный университет" | Coastal protection structure of frozen type |
| CN114960321A (en) * | 2022-07-04 | 2022-08-30 | 吉林大学 | Pi-shaped freeze-thaw resistant roadbed structure and construction method thereof |
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Effective date of registration: 20200818 Address after: 730000 No.318, Donggang West Road, Chengguan District, Lanzhou City, Gansu Province Patentee after: NORTHWEST INSTITUTE OF ECO-ENVIRONMENT AND RESOURCES, CAS Address before: Chengguan District of Gansu city of Lanzhou province Donggang West Road 730000 No. 320 Patentee before: Institute of environment and Engineering in cold and dry areas, Chinese Academy of Sciences |
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