CN1189625C - Penetration wall type vent-pipe applied to frozen soil engineering - Google Patents
Penetration wall type vent-pipe applied to frozen soil engineering Download PDFInfo
- Publication number
- CN1189625C CN1189625C CNB021390096A CN02139009A CN1189625C CN 1189625 C CN1189625 C CN 1189625C CN B021390096 A CNB021390096 A CN B021390096A CN 02139009 A CN02139009 A CN 02139009A CN 1189625 C CN1189625 C CN 1189625C
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- air chimney
- wall type
- type air
- frozen soil
- saturating
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Abstract
The present invention relates to a vent tube with a penetrating wall, which is used in frozen soil engineering. The tube wall of the vent tube with a penetrating wall is provided with a great number of vent holes and can be ventilated. Air can pass through the tube wall with a great number of vent holes to penetrate into surrounding media of the vent tube and can exchange heat with the surrounding media. Thus, the vent tube can effectively cool surrounding media, can match other engineering measures and can effectively restrain the downward trend of the upper limit of perennial frozen soil zones caused by engineering activities. The present invention has great action on the construction of railways and highways built on perennial frozen soil zones to prevent disease aspects such as subgrade settlement, etc. caused by freezing and thawing problems.
Description
Technical field
The saturating wall type air chimney of the present invention is used for the engineering construction technical field of Permafrost Area, is particularly useful for building in the railway and highway subgrade and embankment of tundra.
Background technology
The differential settlement that decline caused of the ever-frozen ground of highway and railway bed, embankment bottom (frozen soil and the discontinuous ever-frozen ground for years) upper limit is the main mode of road damage.Also there are similar state in the railway of other cold district and highway engineering all over the world.A kind of important engineering measure of often using in this class frozen soil engineering is a pre-buried air chimney in roadbed, embankment or the house foundation layer, and has obtained effect.Air chimney is the engineering measure of a kind of not additional labor cooling unit commonly used of perennial cryolithic zone.At present the air chimney that uses is the concrete pipe, generally selects the prefabricated finished product of 25 centimetres of internal diameters or 30 centimetres for use, pipe wall thickness number centimetre.The mechanism of action of the air chimney that this level is laid is to be motive power with the natural blast of ground layer.In China plateau permafrost area, because of height above sea level, influenced significantly by upper air current, not only wind is many for ground layer, wind speed is big, and cardinal wind intensity height, and mean wind speed can reach 0.5 meter per second in the therefore flat air chimney that crouches.The tube wall of this air chimney is the concrete of entity, and its effect is based on forced-convection heat transfer in principle, just just can have influence on the thermal field of tube wall ambient medium by the conduction of heat of draught tube walls material.The validity of the mechanism of action of this air chimney and it as can be seen from the above analysis.But only can find out also that by the heat exchange action of tube wall, efficient can be too not high.
Summary of the invention
The present invention proposes a kind of saturating wall type air chimney that contains the brand new of original meaning.The tube wall of this air chimney is distributed with gravity vent, and just air can be penetrated into by the tube wall with a large amount of eyelets in the air chimney ambient medium and go, so be referred to as meaning " saturating wall type ".Has in essence difference with the air chimney of present use.Saturating wall type air chimney is a cylindrical shape, and material can adopt expanded metal lath to be rolled into cylindrical shape, and with welding or alternate manner forms the wall type air chimney, the selection of mesh is to be principle to prevent that the rubble ballast aggregate from entering the wall type air chimney.Saturating wall type air chimney air intake is provided with the air chimney head that the atresia steel plate is made, but and the door of opening and closing is housed.The length of saturating wall type air chimney also can be formed by connecting by the short air chimney of several joints, if adopt the concrete air chimney, reserves a large amount of gravity vents at tube wall during manufacturing, perhaps places round steel pipe as the tube wall preformed hole when the cast silicone tube, also can be made into the wall type air chimney.
Adopt this wall type air chimney that its superiority is arranged in the ever-frozen ground area.Because enter the cold air of wall type air chimney can be directly and its ambient medium carry out interchange of heat, thereby can make the ambient medium cooling effectively.Match with the Other Engineering measure and can restrain effectively because engineering activity makes the downward trend of the perennial cryolithic zone upper limit.At perennial cryolithic zone, when for example building railway and highway prevent since the freeze thawing problem cause can the big effect of lifting aspect the disease such as subgrade settlement.Because the natural wind of low temperature can be lowered the temperature by the pipeline motion, more because tube wall is ventilative, can be directly and ambient medium carry out interchange of heat, played the effect of getting twice the result with half the effort.
The specific embodiment
The structure of saturating wall type air chimney is a cylindrical shape, and tube wall is distributed with gravity vent, and the internal diameter of saturating wall type air chimney also can be as 25 centimetres～30 centimetres of the internal diameters of common air chimney, also can be bigger or littler.Material can adopt " expanded metal lath " (or claim " expanded metal mesh "), is rolled into cylindrical shape, welding or make it become the saturating wall type air chimney of cylindrical shape with its mode.With the railway bed is example, saturating wall type air chimney will be embedded in the rubble roadbed and contiguous frozen soil layer, therefore the selection of mesh is to be principle to prevent that the rubble ballast aggregate from entering the wall type air chimney, the thickness of expanded metal lath commonly used is by 05 millimeter～12 millimeters, and the expanded metal lath of appropriate thickness is selected in the requirement that saturating wall type air chimney pipe thickness should consider to be embedded in the load that bears in the roadbed and the use and maintenance time limit for use.
If on the bolt tube wall, can precast many gravity vents when adopting the face air chimney.Perhaps when the pipe of pour concrete danger, place round steel pipe, also can make the transparent wall vent pipe as the tube wall preformed hole.The gravity vent that requires the saturating wall type air chimney of bolt according to roadbed design also can only be provided with on the part tube wall.
The length of saturating wall type air chimney should decide with the flat effective length that crouches in roadbed in certain orientation with it, should place the air chimney head of being made by the atresia steel plate in air intake one side, and be configured to open or close the air door that closes.Also can make several sections as saturating wall type air chimney when longer splices at the scene.The laying of saturating wall type air chimney.As when being embedded in the soil subgrade of highway, thoroughly outside the expanded metal lath that wall type selection for pipeline mesh is very little, the anti-filter bed layer of sand gravel of different gradation also should be set or have the geotextiles of very strong gas permeability, so that the soil particle that both can let in air around also can preventing enters in the ventilating duct in transparent wall vent pipe outer wrapping.
In roadbed and embankment that perennial cryolithic zone constructs a railway, answer the well-designed roadbed cross-section structure of burying the wall type ventilating duct underground, and should make the transparent wall vent pipe as far as possible near following frozen soil layer, and will make and have enough safety stocks when the wall type air chimney is anti-to be subjected to load, to reach optimum efficiency.
Saturating wall type air chimney ask distance.Road along the line direction, not wall type ventilating duct arrangement side by side thoroughly, the center to center distance of adjacent ventilating duct is got wall type ventilating duct diameter and is advisable for 3 times～6 times, both can save tubing, and the efficient of wall type air chimney is given full play to.
Claims (4)
1. the saturating wall type air chimney of using in the frozen soil engineering, it is characterized in that the air chimney tube wall is distributed with gravity vent, adopt expanded metal lath to be rolled into cylindrical shape, and welding forms saturating wall type air chimney, saturating wall type air chimney air intake is provided with the air chimney head that the atresia steel plate is made, and but the door of opening and closing is housed, the selection of mesh is to prevent that the rubble ballast aggregate from entering the wall type air chimney.
2. the saturating wall type air chimney of using in the frozen soil engineering according to claim 1 is characterized in that adopting the concrete air chimney, can precast gravity vent or place round steel pipe as the tube wall preformed hole on the tube wall when the pipe of cast danger, makes the wall type air chimney.
3. the saturating wall type air chimney of using in the frozen soil engineering according to claim 1 is characterized in that the length of wall type air chimney can be formed by connecting by the short air chimney of several joints.
4. the saturating wall type air chimney of using in the frozen soil engineering according to claim 1, it is characterized in that the wall type air chimney as in the soil subgrade that is embedded in highway the time, the gravel filter bed layer of different gradation should be set or have the geotextiles of gas permeability in saturating wall type air chimney outer wrapping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021390096A CN1189625C (en) | 2002-09-06 | 2002-09-06 | Penetration wall type vent-pipe applied to frozen soil engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021390096A CN1189625C (en) | 2002-09-06 | 2002-09-06 | Penetration wall type vent-pipe applied to frozen soil engineering |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1480591A CN1480591A (en) | 2004-03-10 |
| CN1189625C true CN1189625C (en) | 2005-02-16 |
Family
ID=34147337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021390096A Expired - Fee Related CN1189625C (en) | 2002-09-06 | 2002-09-06 | Penetration wall type vent-pipe applied to frozen soil engineering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1189625C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357521C (en) * | 2005-08-23 | 2007-12-26 | 中国科学院寒区旱区环境与工程研究所 | Composite ventilating and cold energy gathering roadbed |
| CN101818471A (en) * | 2010-03-25 | 2010-09-01 | 中国科学院寒区旱区环境与工程研究所 | Application of transparent wall vent pipe-massive stone layer cooling and insulating composite road bed in wide road |
| CN105088913B (en) * | 2015-09-10 | 2017-03-15 | 东南大学 | A kind of permafrost area embankment structure |
| CN108169281B (en) * | 2018-01-17 | 2023-08-15 | 绍兴文理学院元培学院 | Vent pipe aperture ratio control test device and method |
| CN110004911B (en) * | 2019-03-29 | 2024-02-13 | 中国科学院西北生态环境资源研究院 | Cold pad system for protecting buried object in permafrost region and construction method thereof |
| CN110983890A (en) * | 2019-12-12 | 2020-04-10 | 四川浩克山青水绿科技有限责任公司 | Existing line soil roadbed frost heaving and thawing sinking treatment method |
| CN116734072B (en) * | 2023-08-16 | 2023-11-03 | 中国科学院西北生态环境资源研究院 | Pipeline supporting device for preventing and treating melting and sinking based on gas heat exchange |
-
2002
- 2002-09-06 CN CNB021390096A patent/CN1189625C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1480591A (en) | 2004-03-10 |
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Granted publication date: 20050216 Termination date: 20110906 |