CN205617177U - Compound cold -storage roadbed structure suitable for permafrost region road engineering - Google Patents
Compound cold -storage roadbed structure suitable for permafrost region road engineering Download PDFInfo
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- CN205617177U CN205617177U CN201620205105.5U CN201620205105U CN205617177U CN 205617177 U CN205617177 U CN 205617177U CN 201620205105 U CN201620205105 U CN 201620205105U CN 205617177 U CN205617177 U CN 205617177U
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- ventilation duct
- road
- filled soil
- hollow block
- embankment filled
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Abstract
The utility model relates to a compound cold -storage roadbed structure suitable for permafrost region road engineering, including upper portion embankment filled soil, lower part embankment filled soil and lay in upper portion embankment filled soil with between the embankment filled soil of lower part and the ventilation pipe of perpendicular to road trend, its characterized in that: the one end or the both ends installation air door of ventilation pipe, it is adjacent lay the hollow block layer between the ventilation pipe, and this ventilation pipe reaches the hollow block upper berth is equipped with a metalling, be equipped with geotechnological cloth on the piece metalling, lay on this geotechnique's cloth upper portion embankment filled soil. The utility model discloses can effectively reach whole, the even key technology index of cooling down of high -grade highway road bed to showing the cooling efficiency that promotes the road bed, improving subgrade stability nature, the possible wave in road surface fluctuates and the crack growth has apparent advantage to reducing.
Description
Technical field
The utility model relates to frozen soil engineering technical field, particularly relates to a kind of be applicable to the compound of permafrost region road engineering
Cold-storage road structure.
Background technology
Frozen soil is the Rock And Soil containing ice that temperature is not higher than 0 DEG C, can be divided into instantaneous frozen soil, season by the length of freezing period
Joint frozen soil and ever-frozen ground.With economic, social development, the engineering construction of Permafrost Area gradually increases, especially road
Engineering.The construction of road engineering will significantly change the Warm status of the ever-frozen ground that underlies, and causes frozen soils temperature rising, bearing capacity fall
Low, and then the sedimentation of roadbed may be caused.Therefore, Frozen soil problems had become as the success of Permafrost Area road project with
No key issue.
In the research of Qinghai-Tibet Railway, in order to ensure the long-time stability of roadbed, researcher proposes active cooling road
The thinking of base, and carried out the research of substantial amounts of active cooling road structure with this thinking for core, and find part road structure
For improving subgrade stability, there is good application effect.But, in high temperature hight-ice-content permafrost district, have roadbed knot at present
All there is the not enough problem of cooling usefulness in structure.Meanwhile, the bituminous paving heat absorption intensity of highway is significantly higher than railway road surface, is related to and grinds
Studying carefully and showing, in Permafrost Area, the strong heat-absorbing action of bituminous paving can cause the steady decay of bottom ever-frozen ground, Yi Jiduo
Year frozen soil upper limit decline, hight-ice-content permafrost thawing etc., and then cause the sedimentation of highway subgrade, a series of engineering such as subside to ask
Topic, under conditions of Future Climate persistently warms, this problem will be more prominent.
At present, the construction of Qinghai-Tibet highway has been brought into schedule, owing to the width of roadway of highway compares Qinghai-Tibet public affairs
Road has had and has been significantly increased, and roadbed heat absorption intensity also will be multiplied.In order to ensure Qinghai-Tibet highway build after stability, high
Temperature hight-ice-content permafrost district section must use rational active cooling regulation measure.But, owing to embankment breadth significantly increases
Greatly, the application effect having regulation measure at present is caused to will further decrease.To this end, researcher attempts arranging existing regulation and control
Execute and be combined, to the controlling performance of raising engineering measure, but owing to designing the deficiency of structure, it is difficult to meet engineering actual
Need.As: " the cooling and insulating composite road bed application in broad width road of a kind of perforated ventilation pipe-block rubble " (Lai Yuanming, Dong Yuan
Grand, Zhang Mingyi: China, 201010133544.7 [P]. 2010.09.01) propose a kind of perforated ventilation pipe-block rubble and be combined
Perforated ventilation pipe is placed on pipe-massive stone layer by roadbed, and it is not enough in the cooling efficiency of cold season；And at warm season, this kind of structure
Transmural hole, by incoming for amount of heat block stone layer, reduces the cold accumulation effects of block stone layer." composite temperature controlled ventilation roadbed " (Yu Qihao,
Cheng Guodong, Niu Fujun etc.: China, 200410002135.8 [P]. 2004.12.22) propose a kind of automatic temperature-controlled ventilation duct-
The composite road bed structure of warming plate, but in this structure, ventilation duct temperature-fall period has significant inhomogeneities, to control roadbed not
Uniform settlement is disadvantageous." reinforced ventilating heat-proof foundation " (Li Guoyu, Li Ning, Niu Fujun etc.: China, 200710017288
[P]. 2007.08.08) propose the reinforced ventilating heat-proof foundation of a kind of automatic control perforated ventilation pipe-block rubble-insulation material, but
In this structure, the bed course under ventilation duct is relatively thin, and the ventilation mouth of pipe is easily crammed by snow and dust storm etc. at cold season, causes cold season to be lowered the temperature significantly
Reduce；In addition, fragment rock layers can play good heat-blocking action at warm season, the insulation material that its top is placed is for enhancing roadbed
Effect of heat insulation meaning less, but significantly reduce the cooling-down effect of roadbed cold season；Although additionally, perforated ventilation pipe exists
Part engineering is tested, but does not have document to show that this measure is compared common ventilation pipe and had significant advantage, and this is arranged
Execute and but can cause being greatly improved of construction costs.
Additionally, the application that heat pipe measure conventional in frozen soil engineering at present is in road engineering there is also problem.Due to
The temperature-fall period of this measure has significant inhomogeneities, and existing application experience shows that this measure is drawn in the application of road engineering
Play growth (crack (Yu Qihao, Fan Kai, Qian Jin, Guo Lei, You Yanhui, China's ever-frozen ground that heat pipe roadbed is grown of roadbed cracks
District's highway build key issue research, Chinese science: technological sciences, 2014,44(4): 425 ~ 432)).Based on height
The speed settling amount for roadbed for the highway and the strict demand in crack, such highway has spy for overall, the uniform decrease in temperature of roadbed
Different requirement.Therefore, current existing method there is no the construction requirements that method meets permafrost region highway, and needs are sought more high
Effect, rational frozen earth roadbed safeguard measure.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of effectively reduction frozen soil ground temperature, improves frozen earth stable
The compound cold-storage road structure being applicable to permafrost region road engineering.
For solving the problems referred to above, a kind of compound cold-storage roadbed being applicable to permafrost region road engineering described in the utility model
Structure, including top embankment filled soil, bottom embankment filled soil and be laid in described top embankment filled soil and described bottom embankment filled soil
Between and be perpendicular to the ventilation duct of trend of road, it is characterised in that: air door is installed in the one or both ends of described ventilation duct；Adjacent institute
State between ventilation duct laying hollow block layer, and be equipped with pipe-massive stone layer on this ventilation duct and described hollow block；Described pipe-massive stone layer
It is provided with geotextiles, this geotextiles is laid described top embankment filled soil.
The caliber of described ventilation duct is 30 ~ 60cm, and pipe thickness is 3 ~ 6cm, and tube center distance is from natural surface apparent height
It is 0.5 ~ 2.0m.
The spacing of adjacent described ventilation duct is 1 ~ 3 times of described ventilation duct caliber.
The thickness of described hollow block layer is consistent with described ventilation duct diameter, and hollow block is by the length of side 6 ~ 30cm, wall thickness 2 ~ 6cm
Concrete prefabricated hollow cube or cuboid constitute.
The particle diameter of described pipe-massive stone layer be 10 ~ 40cm, laying depth be 1 ~ 2m.
The utility model compared with prior art has the advantage that
1st, Innovation project measure regulatory mechanism.
First it is the aspect linkage in embankment, cooling mechanism.In cold season temperature-fall period, between ventilation duct pipe in hollow block layer
Macroporosity heat convection effect between ventilation duct is significantly strengthened, be effectively formed ventilation duct hollow block aspect linkage,
Cooling mechanism, is the basic mechanism realizing roadbed entirety, uniform decrease in temperature；Next to that homeostasis is machine-processed.At warm season, due to roadbed
The difference of Schattenseite, tailo solar radiation and domatic temperature, in causing embankment cross section, roadbed arranged on left and right sides ground temperature is certain
Otherness, due to the existence of the big space condition of block stone layer and hollow block, can be at the block stone in embankment cross section, hollow block layer
In, between embankment left and right side different parts, produce certain Convective Heat Transfer, thus balance the ground temperature difference of embankment, produce
The ground temperature homeostasis mechanism of means of livelihood base；Finally, the present invention is the cold-storage mechanism of roadbed.In temperature-rise period, due to temperature certainly
Dynamic should, the timely closedown of control air door, in ventilation duct, in hollow block and block stone layer, the stopping of vertical Convective Heat Transfer, leads
Hot property is greatly reduced, and effectively stores the cold energy of roadbed gathering in internal winter, thus circulates and effectively reach constantly to reduce frozen soil temperature
The purpose of degree.
2nd, High-Grade Highway Subgrade entirety, a key technology difficult problem for uniform earth temperature controlling are effectively solved.
Firstly, since the linkage of above-mentioned aspect, the formation of cooling mechanism, thereby result in the overall aspect of embankment of temperature-fall period
Synchronization, uniform decrease in temperature, and form 0 DEG C of ground temperature isopleth, smooth, the symmetrical favourable form of overall Temperature Field.Secondly, above-mentioned
Under homeostasis mechanism, effectively alleviate warm season roadbed ground temperature otherness, be further ensured that Temperature Field uniformity.Thus, by two
The synthesis of person, effectively solves high-grade highway entirety, a difficult problem for uniform ground temperature regulation and control.
3rd, it is obviously improved the cooling usefulness of roadbed.
Just because of the above-mentioned cooling of the utility model, balance, the existence of the triple mechanism of cold-storage, superposition, road is being effectively ensured
While base entirety, uniform decrease in temperature, cooling usefulness is also made to be greatly improved.
4th, it is effectively increased subgrade stability.
Although existing measure effectively reduces the ground temperature of roadbed to a great extent, but as the change in season and roadbed are necessarily
The frozen-thaw process occurring in depth bounds, inevitably causes and occurs roadbed frost damage, thaw collapse to a certain extent, and to roadbed
Stability affects.Owing to block stone layer belongs to stress equilibrium flexible, self-basis, the block stone that the utility model is laid
Layer can alleviate the adverse effect that unfreezing causes to a great extent.Therefore, block stone layer of the present utility model has temperature adjustment, tune
Deformation double action.Thus, the probability of happening of roadbed potential secondary subgrade engineering disease is greatly reduced, improves stablizing of roadbed
Property.
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 cross-sectional view of the present utility model.
Fig. 2 is skiagraph of the present utility model.
Fig. 3 is for using the right of roadbed cross section, the utility model rear venting pipe position frozen soil upper limit and other two kinds of measures
Ratio.
Fig. 4 is the contrast of vertical section, roadbed center frozen soil upper limit after use the utility model and other two kinds of measures.
In figure: 1 ventilation duct 2 air door 3 pipe-massive stone layer 4 hollow block layer 5 geotextiles 6 top embankment
Banket 7 bottom embankment filled soil 8 natural surfaces.
Detailed description of the invention
As shown in Figure 1 and Figure 2, a kind of compound cold-storage road structure being applicable to permafrost region road engineering, including top embankment
Banket the 6th, bottom embankment filled soil 7 and be laid between top embankment filled soil 6 and bottom embankment filled soil 7 and be perpendicular to trend of road
Ventilation duct 1.Air door 2 is installed in the one or both ends of ventilation duct 1；Hollow block layer 4, and this ventilation duct 1 is laid between adjacent ventilation duct 1
And it on hollow block layer 4, is equipped with pipe-massive stone layer 3；Pipe-massive stone layer 3 is provided with geotextiles 5, this geotextiles 5 is laid top embankment and fills out
Soil 6.
Wherein: the caliber of ventilation duct 1 is 30 ~ 60cm, pipe thickness is 3 ~ 6cm, and tube center distance is high from natural surface 8 surface
Degree is 0.5 ~ 2.0m.
The spacing of adjacent ventilation duct 1 is 1 ~ 3 times of ventilation duct 1 caliber.
The thickness of hollow block layer 4 is consistent with ventilation duct 1 diameter, and hollow block is by the coagulation of the length of side 6 ~ 30cm, wall thickness 2 ~ 6cm
The cube of soil precast hollow or cuboid are constituted.
The particle diameter of pipe-massive stone layer 3 be 10 ~ 40cm, laying depth be 1 ~ 2m.
Utility model works mechanism:
At cold season, ventilation duct 1 automatic control air door 2 automatically opens up, and cool ambient air enters ventilation duct 1, quick reduction road around
Dike soil temperature, in roadbed, heat discharges in a large number；Simultaneously as tube wall temperature is very low, and surrounding hollow block layer 4 internal pore is relatively
Greatly, formed thus in hollow block layer 4 under strong heat convection effect, increase the cooling extent of the soil body between pipe, improve roadbed
The globality of temperature-fall period.At warm season, ventilation duct 1 automatic control air door 2 is automatically switched off, and stops external heat to enter in pipe, significantly subtracts
The caloric receptivity of little roadbed；Simultaneously as the characteristic that in temperature, relative superiority or inferiority is low, in pipe-massive stone layer 3 and hollow block, there is not heat convection
Effect, the heat-conductive characteristic of himself is poor, thus plays the effect stoping heat to transmit, pipe-massive stone layer 3 to roadbed at warm season
The application of top geotextiles 5 can ensure that a layer internal pore does not significantly reduces in longer period, it is ensured that this list of roadbed
To the long-term effectiveness of heat conductivility.
The concrete application example of the present invention 1:
(1) the natural surface 8 in compacting fills bottom embankment filled soil 7 and tamps, banket exceed former natural surface 0.5 ~
2.0m。
(2) on the bottom embankment filled soil 7 of compacting, lay the prefabricated ventilation with automatic control air door 2 being perpendicular to trend of road
Pipe 1, a diameter of 30 ~ 60cm of ventilation duct 1, pipe thickness is 3 ~ 6cm, and tube pitch is 1 ~ 3 times of caliber.
(3) arbitrarily stacking prefabricated concrete hollow block between ventilation duct 1, concrete hollow block is cube or rectangular
Body, the length of side is 6 ~ 30cm, and wall thickness is 2 ~ 6cm.
(4) stacking pipe-massive stone layer 3 at ventilation duct 1 and hollow block layer 4 top, block ballast grain sizes is 10 ~ 40cm, fragment rock layers
Thickness 1 ~ 2m, then carries out vibratory compaction.
(5) on pipe-massive stone layer 3, lay one layer of geotextiles 5, then fill top embankment filled soil 6 and tamp.
In order to verify effectiveness of the present utility model, and contrast with the effectiveness of prior art, carried out not
With the numerical simulation analysis of engineering measure effectiveness, and the frozen soil upper limit distribution under calculated different operating modes is carried out
Contrast, such as Fig. 3 ~ 4.Wherein Fig. 3 represents the frozen soil upper limit distribution on cross section, ventilation duct center, and Fig. 4 represents roadbed center
Frozen soil upper limit distribution on vertical section, position, in figure, " prior art 1 " is the technology of Application No. 200710017288, " existing
Technology 2 " is the technology of Application No. 201010133544.7.It will be seen that the relatively current prior art of the utility model has
Notable application advantage, can be greatly reduced frozen soil natural surface temperature, and ensure the globality of temperature-fall period, uniformity.Wherein:
1. usefulness raising aspect:
Comparing existing at present two kinds of analogous technical, the utility model is greatly improved in the cooling efficiency of cold season, warm season
Heat-proof quality has also strengthened, and therefore, use of the present utility model makes the year border cooling usefulness of roadbed compare and has skill at present
Art significantly improves.Fig. 3 is frozen soil upper limit on cross section, roadbed ventilation duct position (i.e. 0 DEG C thermoisopleth) distribution, can be seen by figure
Arrive, have two kinds of analogous technical at present and be merely capable of lifting Lu Zhongzhi Schattenseite bottom frozen soil upper limit, and uplift scope is limited；And
Near tailo, frozen soil upper limit position, roadbed bottom is even below natural frozen soil upper limit, and Slopes effect is notable.The utility model can
So that the cooling efficiency of roadbed is greatly improved, Schattenseite frozen soil upper limit has small size lifting relative to other two kinds of technology.Meanwhile, this practicality is new
Type can the frozen soil upper limit of notable lifting tailo bottom so that 0 DEG C of thermoisopleth reaches near natural surface and along roadbed cross section
Basic holding level, eliminates the Slopes effect of roadbed to a great extent.
2. cooling globality aspect:
Fig. 4 be frozen soil upper limit on vertical section, roadbed center (i.e. 0 DEG C thermoisopleth) distribution, by figure it will be seen that this
The application of utility model makes the relatively current prior art in frozen soil upper limit position have notable lifting, and its significantly more advantage
It is: pipe is lower and pipe pereletok upper limit position difference is very little, the globality highly significant of roadbed temperature-fall period, and other technology,
Especially in prior art 1, frozen soil upper limit buried depth is along the big rise and fall of road-trend, and the globality of roadbed cooling is very poor.
Owing to the mechanical strength of frozen soil is affected by temperature significantly, temperature raises even thawing and frozen soil mechanics can be caused strong
Being greatly reduced of degree.Therefore, if soil body frozen soil upper limit buried depth is more than the lower soil body of pipe, the mechanical strength meeting of the soil body between pipe between ventilation duct
Significantly reducing, meanwhile, this position is likely to be formed watershed, may cause road surface under the vehicle dynamic load long term of top
Heaving of the sea, the growth in crack, even road frost boiling.Strictly want owing to highway road pavement flatness and crack all have
Asking, therefore current prior art cannot meet the construction demand of following highway.Application of the present utility model enhances roadbed
At the cooling extent of cold season, greatly improve the globality of roadbed cooling；Meanwhile, roadbed is increased in the heat-proof quality of warm season
By force.By use of the present utility model, the cooling efficiency of roadbed not only can be effectively improved, additionally it is possible to roadbed temperature is greatly improved
The globality of field, uniformity, the heaving of the sea possible for reduction road surface and fracture development have significant advantage.
Claims (5)
1. it is applicable to a compound cold-storage road structure for permafrost region road engineering, including top embankment filled soil (6), bottom embankment
Banket (7) and be laid between described top embankment filled soil (6) and described bottom embankment filled soil (7) and be perpendicular to trend of road
Ventilation duct (1), it is characterised in that: air door (2) is installed in the one or both ends of described ventilation duct (1)；Adjacent described ventilation duct (1) it
Between lay and be equipped with pipe-massive stone layer (3) on hollow block layer (4), and this ventilation duct (1) and described hollow block layer (4)；Described piece broken
Rock layers (3) is provided with geotextiles (5), and this geotextiles (5) is upper lays described top embankment filled soil (6).
2. a kind of compound cold-storage road structure being applicable to permafrost region road engineering as claimed in claim 1, it is characterised in that:
The caliber of described ventilation duct (1) is 30 ~ 60cm, and pipe thickness is 3 ~ 6cm, and tube center distance from natural surface (8) apparent height is
0.5~2.0m。
3. a kind of compound cold-storage road structure being applicable to permafrost region road engineering as claimed in claim 1, it is characterised in that:
The spacing of adjacent described ventilation duct (1) is 1 ~ 3 times of described ventilation duct (1) caliber.
4. a kind of compound cold-storage road structure being applicable to permafrost region road engineering as claimed in claim 1, it is characterised in that:
The thickness of described hollow block layer (4) is consistent with described ventilation duct (1) diameter, and hollow block is by the length of side 6 ~ 30cm, wall thickness 2 ~ 6cm
Concrete prefabricated hollow cube or cuboid are constituted.
5. a kind of compound cold-storage road structure being applicable to permafrost region road engineering as claimed in claim 1, it is characterised in that:
The particle diameter of described pipe-massive stone layer (3) be 10 ~ 40cm, laying depth be 1 ~ 2m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620205105.5U CN205617177U (en) | 2016-03-17 | 2016-03-17 | Compound cold -storage roadbed structure suitable for permafrost region road engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620205105.5U CN205617177U (en) | 2016-03-17 | 2016-03-17 | Compound cold -storage roadbed structure suitable for permafrost region road engineering |
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| CN205617177U true CN205617177U (en) | 2016-10-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107201708A (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 compound cold-storage roadbed suitable for permafrost region road engineering |
| CN108411727A (en) * | 2018-01-17 | 2018-08-17 | 绍兴文理学院元培学院 | A kind of frozen earth roadbed structure of wide cut |
| CN109505208A (en) * | 2018-03-20 | 2019-03-22 | 中国科学院寒区旱区环境与工程研究所 | A kind of prefabricated section and frozen earth roadbed composite construction for frozen earth roadbed cooling |
-
2016
- 2016-03-17 CN CN201620205105.5U patent/CN205617177U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107201708A (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 compound cold-storage roadbed suitable for permafrost region road engineering |
| CN108411727A (en) * | 2018-01-17 | 2018-08-17 | 绍兴文理学院元培学院 | A kind of frozen earth roadbed structure of wide cut |
| CN109505208A (en) * | 2018-03-20 | 2019-03-22 | 中国科学院寒区旱区环境与工程研究所 | A kind of prefabricated section and frozen earth roadbed composite construction for frozen earth roadbed cooling |
| CN109505208B (en) * | 2018-03-20 | 2023-08-22 | 中国科学院西北生态环境资源研究院 | Precast block for cooling frozen soil roadbed and frozen soil roadbed composite structure |
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Effective date of registration: 20200811 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 |