CN107201701A - The complete ventilated formula frozen soil ventilation embankment of wall - Google Patents
The complete ventilated formula frozen soil ventilation embankment of wall Download PDFInfo
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- CN107201701A CN107201701A CN201610152073.1A CN201610152073A CN107201701A CN 107201701 A CN107201701 A CN 107201701A CN 201610152073 A CN201610152073 A CN 201610152073A CN 107201701 A CN107201701 A CN 107201701A
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- embankment
- frozen soil
- ventilation
- ventilation duct
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The present invention relates to a kind of complete ventilated formula frozen soil ventilation embankment of wall, the embankment includes the semi-circular recesses being located in embankment filled soil and the inverted U ventilation duct for being embedded on the semi-circular recesses and being communicated with the external world.The present invention changes the heat exchanged mechanism of conventional ventilation duct, greatly improve the heat exchanger efficiency of ventilation pipe foundation, not only pass through the evaporation condition that effectively reduction subgrade defect is produced of moisture, and regulated and controled by effective heat convection, it at utmost make use of the cold energy natural conditions of Permafrost Area, while constantly reduction frozen soils temperature, frozen earth roadbed stability is effectively lifted.
Description
Technical field
The present invention relates to frozen soil engineering technical field, more particularly to the ventilated formula frozen soil ventilation embankment of full wall.
Background technology
In Permafrost Areas such as China Qinghai-Tibet Platean, northeast, by long-term evolution, development and change, form thick up to several meters, even more than ten meters, the Thick Underground Ice of each tool form.With the change of climatic environment, the influence of Human dried bloodstains, frozen soil and ground ice can be caused to degenerate and melt, so as to cause the generation of various engineering project disasters, material impact is produced to various Important Project structural stabilities.
Pass through the use of protection of permafrost engineering measure; active cooling frozen soil basis, is to ensure the operation of frozen soil engineering long-term safety, stable critical path, and in these measures; the Convective Heat Transfer of Effective Regulation frozen soil engineering, is a type of the important engineering measure in protection of permafrost basis.Such measure is by effectively facilitating basis and the heat transfer process of external environment under winter or cool night temperatures environmental condition, and effectively suppress heat transfer process basic under warm season or daytime high ambient conditions, thus reach continuous storage of the cold energy inside roadbed, the continuous reduction of frozen soil ground temperature, stability of foundation constantly enhanced purpose.
Ventilated embankment is one kind in the important engineering measure of Permafrost Area protection of permafrost.But, because different, ventilation tube wall heat exchange property the difference of structural shape all can produce material impact to the overall heat exchange efficiency of roadbed.Thus, the emphasis of many technical concerns and research and development is also just turned into.
《Transmural formula ventilation duct in frozen soil engineering》（Ge Xiurun, 02139009.6）, although ventilation tube wall has a large amount of ventilation holes, and air directly can directly carry out heat exchange with the soil property around ventilation duct, but less air velocity in less hole, ventilation duct, it is difficult to play heat convection effect.Conversely, because air conduction coefficient is only 0.027W/mK, instead the air layer being detained in hole plays heat-blocking action, however reduce the heat convection effect of ventilation duct.
《One kind ventilation block stone layer wide cut road structure》（Fang Jianhong, 201420799258.8）, limited by the block stone air permeable rate of the confined space, the air flow process, heat convection in block stone layer are all very limited, it is difficult to effectively carry out the cooling of roadbed.
Further, since Qinghai-Tibet exceedingly odious natural environment so that job site is difficult to the concrete prefabricated production of ventilation duct.And in the height above sea level ventilation duct that lower ground area is produced, due to predominantly occupying the hollow unit of volume so that the freight volume of per car is very limited, thus largely increase engineering construction cost.
In face of the appearance of national " 13 " strategical planning, Qinghai-Tibet highway will face build, and still, highway is compared with common road, and common road Frozen soil problems compared with railway are all more prominent.There are some researches show（The such as Yu Qihao China Permafrost Area highway builds key issue research Chinese sciences（Technological sciences）, 2014,44（4）: 425 ~ 432）Due to the strong endothermic of dark-coloured pavement, bituminous paving water proof and the influence for preventing moisture evaporation from radiating, so that the same terms are got down the highway, the heat absorption intensity of roadbed is railway more than 3 times, and the main path of roadbed heat absorption is concentrated mainly on the centre of embankment, and is difficult to radiate to frozen soil around.And highway exacerbates the appearance of the phenomenon compared with common road, more.When about 1 times of highway subgrade width increase, about 0.6 times of the heat absorption intensity increase of embankment bottom surface, roadbed, which absorbs heat, is further gathered in the centre of roadbed, thus produces more obvious " heat build-up effect ", and cause frozen soil more quickly to be degenerated.In face of higher technical standard, broader highway pavement, the heat effect between highway and frozen soil is more notable, and highway is built in Permafrost Area will be in face of more prominent Frozen soil problems and build technical barrier.Due to the radical change in terms of heat transfer path, intensity, it is difficult to directly apply in the expressway construction of Qinghai-Tibet by the successful experience of the acquisitions such as Qinghai-Tibet Railway, advanced technology.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of ventilated formula frozen soil ventilation embankment of full wall for strengthening frozen earth roadbed heat convection efficiency.
To solve the above problems, the ventilated formula frozen soil ventilation embankment of full wall of the present invention, it is characterised in that：The embankment includes the semi-circular recesses being located in embankment filled soil and the inverted U ventilation duct for being embedded on the semi-circular recesses and being communicated with the external world.
The inverted U ventilation duct mutually agrees with the semi-circular recesses, and is constituted by connecting as one in semicircle or the top surface of parabolic shape section, skew wall supporting section and base section.
The height of the top surface section is 5 ~ 20cm.
The height of the skew wall supporting section is 0 ~ 20cm, and is 0 ~ 45 ° with the angle of vertical line.
The depth of the semi-circular recesses is 0 ~ 20cm.
The inverted U ventilation duct is one kind in the armored concrete, concrete, foamed concrete of prefabricated reinforced concrete prefabricated component and cast-in-site.
The present invention has advantages below compared with prior art：
1st, the change of heat exchanged mechanism.
First, original draft tube aeration roadbed Convective Heat Transfer is changed, the heat transfer process of conventional ventilation pipe foundation is the heat transfer by concrete ventilation tube wall, realizes the indirect heat exchange of embankment filled soil and convected air.And the present invention is then the direct heat transfer banketed between convected air；Secondly, moisture evaporation, the heat transfer process of heat dissipation are added.Conventional ventilation duct is acted on the cut-off of the soil body so that the moisture inside embankment is difficult to distribute, and the change of present invention exchange hot mode and approach, can absorb substantial amounts of heat by the evaporation of moisture, phase transition process.Due to the drought environment condition of Qinghai-Tibet Platean, all this kind of heat exchanged mechanism is caused to occupy larger proportion in overall heat exchange.
2nd, significantly more heat exchange, cooling efficiency.
Firstly, since above-mentioned Dual heat exchange mechanism changes so that roadbed overall heat exchange ability significantly strengthens；Secondly as the reduction of embankment moisture, also causes thermal conductivity factor increase, the heat conductivility enhancing of the soil body so that embankment overall heat exchange ability is inherently further improved；Effectively combined of both exactly so that the cooling efficiency of this kind of measure is significantly increased.
3rd, effective reduction of potential engineering disease.
Frozen earth roadbed engineering disease is mainly frost heave, thaw collapse, and reason is freezing, melting for roadbed internal moisture the need for producing this kind of disease.In original ventilated embankment structure, precast concrete pipeline satisfies the need the enclosed construction of dike internal moisture, has separated the evaporation channel of embankment moisture.And of the invention, the permeability type structure of heat convection bottom so that the moisture inside embankment can be distributed effectively, thus the moisture effectively inside reduction roadbed, it is possible thereby to which frost heave, the disease rate of thaw collapse is greatly reduced.
4th, the reduction of engineering building material cost, the raising of cost performance.
First, it is the reduction about 30 ~ 40% using prefabricated reinforced concrete material；Secondly, the precast member for reinforcing bar concrete that the present invention is designed, with can mutually stack advantage, while bicycle volume of transport, reduction cost of transportation is greatly improved, decreases breaking damage of goods rate.Effectively eliminate that conventional ventilation duct is hollow, accounting space is big, cost of transportation is high, the big problems of breakage rate.Thus engineering building material cost is effectively reduced.
5th, the reduction in engineering construction cycle.
In the construction of conventional precast concrete ventilation duct, to ensure the stability of embedded ventilation duct, it is necessary in the embankment filled soil after closely knit, ventilation duct be excavated again and buries groove, splice installation ventilation duct again.It will also result in ventilation duct simultaneously to be difficult to be in close contact with surrounding soil, and influence to ventilation duct and the heat transfer process of surrounding soil.And it is of the invention, can specify that position, it is closely knit after the upper directly laying of embankment filled soil layer, assembled ventilation duct, not only technique simplifies, and the construction period shortens.
Brief description of the drawings
The embodiment to the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is structural representation of the invention.
Fig. 2 is side view of the invention.
Fig. 3 is inverted U-shaped ventilation duct structural representation in the present invention.
Fig. 4 is the engineering structure schematic three dimensional views in embodiment in the present invention.
In figure：1-embankment filled soil；2-inverted U-shaped ventilation duct；3-top surface section；4-skew wall supporting section；5-base section；6-semi-circular recesses.
Embodiment
As shown in Fig. 1 ~ 4, the complete ventilated formula frozen soil ventilation embankment of wall, the embankment includes the semi-circular recesses 6 being located in embankment filled soil 1 and the inverted U ventilation duct 2 for being embedded on semi-circular recesses 6 and being communicated with the external world.
Wherein：
Inverted U ventilation duct 2 mutually agrees with semi-circular recesses 6, and is constituted by connecting as one in semicircle or the top surface of parabolic shape section 3, skew wall supporting section 4 and base section 5.The height of top surface section 3 is 5 ~ 20cm.The height of skew wall supporting section 4 is 0 ~ 20cm, and is 0 ~ 45 ° with the angle of vertical line.
Inverted U ventilation duct 2 is one kind in the armored concrete, concrete, foamed concrete of prefabricated reinforced concrete prefabricated component and cast-in-site.
The depth of semi-circular recesses 6 is 0 ~ 20cm.
Concrete application of the present inventionExample 1：
(1) in the natural earth's surface of Permafrost Area, 1 is banketed according to the laying of 0.3 ~ 0.5m thickness direct layering, compact embankment, to 1.5m height.
(2) carry out place it is smooth, banketed using oscillatory type forcing press compaction subgrade 1 compactness to 0.95.
(3) the construction of semi-circular recesses 6 is aerated according to 100cm spacing.Using semicircle jump bit, vertical road-trend, along the construction line progress order impact drawn in advance to 10cm depth.It is consequently formed the semi-circular recesses 6 that continuous, smooth, depth is 10cm.
(4) inverted U ventilation duct 2 semicircle, highly for 20cm top surfaces section 3 is used.
(5) carry out by machinery or manually the laying of inverted U-shaped ventilation duct 2, splice in proper order.Meanwhile, the both sides 20cm of embankment filled soil 1 is stretched out in the inverted U-shaped bottom of ventilation duct 2.Thus the installation of wherein one inverted U-shaped ventilation duct 2 is completed.Thus circulate, complete the installation of the whole inverted U-shaped ventilation duct 2 of construction section.
(6), according to conventional construction process, filling and promoting for embankment filled soil 1 is carried out by completing one of installation of the whole inverted U-shaped ventilation duct 2 of construction section.To protect the safety of inverted U-shaped ventilation duct 2, banketing for this time controls thickness to be 50cm.Then flattened and vibroroller cmpacting.Then according to routine, follow-up engineering construction is carried out.
Concrete application of the present inventionExample 2：
The construction of step (3) need not be carried out.Directly carry out the installation of inverted U-shaped ventilation duct 2.Then according to it is conventional, carry out follow-up construction in proper order.Thus operating efficiency is further improved.
Claims (6)
1. the complete ventilated formula frozen soil ventilation embankment of wall, it is characterised in that：The embankment includes being located at embankment filled soil（1）Interior semi-circular recesses（6）And it is embedded in the semi-circular recesses（6）Inverted U ventilation duct that is upper and being communicated with the external world（2）.
2. the ventilated formula frozen soil ventilation embankment of full wall as claimed in claim 1, it is characterised in that：The inverted U ventilation duct（2）With the semi-circular recesses（6）Mutually agree with, and by connecting as one in semicircle or the top surface of parabolic shape section（3）, skew wall supporting section（4）And base section（5）Constitute.
3. the ventilated formula frozen soil ventilation embankment of full wall as claimed in claim 2, it is characterised in that：The top surface section（3）Height be 5 ~ 20cm.
4. the ventilated formula frozen soil ventilation embankment of full wall as claimed in claim 2, it is characterised in that：The skew wall supporting section（4）Height be 0 ~ 20cm, and be 0 ~ 45 ° with the angle of vertical line.
5. the ventilated formula frozen soil ventilation embankment of full wall as claimed in claim 1, it is characterised in that：The semi-circular recesses（6）Depth be 0 ~ 20cm.
6. the ventilated formula frozen soil ventilation embankment of full wall as claimed in claim 1, it is characterised in that：The inverted U ventilation duct（2）For one kind in the armored concrete, concrete, foamed concrete of prefabricated reinforced concrete prefabricated component and cast-in-site.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610152073.1A CN107201701B (en) | 2016-03-17 | 2016-03-17 | Full-wall ventilation type frozen soil ventilation embankment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610152073.1A CN107201701B (en) | 2016-03-17 | 2016-03-17 | Full-wall ventilation type frozen soil ventilation embankment |
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| Publication Number | Publication Date |
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| CN107201701A true CN107201701A (en) | 2017-09-26 |
| CN107201701B CN107201701B (en) | 2023-07-07 |
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