CN101387110B - Reinforcing method of large area frozen earth foundation building and automatic cooling-down temperature-averaging reinforcement system - Google Patents
Reinforcing method of large area frozen earth foundation building and automatic cooling-down temperature-averaging reinforcement system Download PDFInfo
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- CN101387110B CN101387110B CN 200810156945 CN200810156945A CN101387110B CN 101387110 B CN101387110 B CN 101387110B CN 200810156945 CN200810156945 CN 200810156945 CN 200810156945 A CN200810156945 A CN 200810156945A CN 101387110 B CN101387110 B CN 101387110B
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Abstract
The invention relates to a method for reinforcing large-area frozen soil foundation buildings, as well as an automatic temperature lowering-balancing reinforcement system, which belongs to the technical field of building engineering. A thermosiphon is arranged in a frozen soil foundation by the methods of inserting, burying, filling and the like, and the thermosiphon consists of an evaporating section, a condensing section and a connecting pipe. The evaporating section of the thermosiphon is inserted into a frozen soil layer; the condensing section of the thermosiphon is arranged around a to-be-built object; and the condensing section and the evaporating section are connected through the connecting pipe obliquely arranged. Therefore, the method solves the problem that the center position of a large-area frozen soil foundation building can be provided with the thermosiphon in order to freeze and reinforce frozen soil under the foundation, especially the problem about the temperature field instability of a large building, and simultaneously solves the difficult problem about the long construction period of excavating large-area frozen soil. The method has the advantages of little investment, short construction period and good effects.
Description
Technical field
The present invention relates to the foundation reinforcement method in a kind of frozen earth foundation building construction, the reinforcement means and the system thereof of especially a kind of tundra building ground, specifically a kind of reinforcement means of large area frozen earth foundation building and automatic cooling-down temperature-averaging reinforcement system.
Background technology
As everyone knows, build building such as oil tank, gas tank, multistory building etc. in the tundra is a difficult problem that is difficult to overcome always.This is owing to frozen soil causes the ground shakiness being subjected to the influence of the temperature difference to dissolve and freeze in two seasons of summer in winter, and this point is especially dangerous in summer.And the method for utilizing the conventional backfill of digging pit in the tundra is carried out ground stabilization and is not only operated very difficultly, and cost is huge.
For the present comparatively successful solution of the ground of small size is to utilize hot pin to solve, Qinghai-Tibet Railway as China should successfully utilize the hot pin technology to solve the reinforcing problem of frozen soil foundation in the part highway section, but because the influence basin of hot pin is generally about 2-6 rice, if spacing is greater than more than 6 meters the time, hot pin just can not play due effect.
At some cold districts also is the oil gas prolific area simultaneously, in these areas the area of base of supporting oil storage tank, house, work station etc. generally thousands of square metres of hundreds ofs, the distance of adjacent edge can reach tens to rice up to a hundred when maximum, therefore utilize existing hot pin reinforcement means can't satisfy it and reinforce requirement.
Summary of the invention
It is big to the objective of the invention is to reinforce difficulty at large area frozen earth foundation, and the problem that cost is high is invented a kind of reinforcement means and automatic cooling-down temperature-averaging reinforcement system of large area frozen earth foundation building.
One of technical scheme of the present invention is:
A kind of reinforcement means of large area frozen earth foundation is characterized in that:
At first, primary surface character in base area processes 1～4 meter dark hole of filling out being reinforced the thing foundation surface;
Secondly insert in the frozen soil layer by the evaporator section of the interval of setting described filling out in the hole thermal siphon, the condensation segment that makes thermal siphon is from filling out the hole periphery and stretch out and making its arranged around of being built thing above ground, and every thermal siphon is made up of evaporator section, tube connector and condensation segment;
Backfill sandstone material or backfill in filling out the hole at last, or the mixture of sandstone material and backfill forms the sand bed that bankets promptly get the thermal siphon formula samming foundation structure of lowering the temperature automatically after the completion.
The tube connector of described thermal siphon is tilting installation.
Be provided with heat insulation layer in the bottom of filling out the hole, be provided with the backfill sand bed in the heat insulation layer bottom, horizontal arrangement has the samming hot pin in the backfill sand bed.
The samming hot pin of horizontal arrangement has two layers in the backfill sand bed, and described two layers of samming hot pin space intersection or quadrature.
Two of technical scheme of the present invention is:
A kind of large area frozen earth foundation hardened system, it is installed in the thermal siphon formula pipe that is reinforced on the ground by many at interval by setting and forms, being reinforced ground is made up of banket sand bed and frozen soil layer, frozen soil layer is positioned at the bottom of the sand bed that bankets, and it is characterized in that described thermal siphon formula pipe is made up of the tube connector that is arranged in the sand bed that bankets that is inserted into the evaporator section that is reinforced in the ground frozen soil layer, is inserted into the condensation segment of the thermal siphon formula pipe around the building that is reinforced on the ground and connects evaporator section and condensation segment.
Described tube connector is tilting installation, so that condensed water is dropped in the evaporator section under action of gravity naturally.
Bottom in the described sand bed that bankets also is provided with heat insulation layer, is horizontally installed with the samming thermal siphon formula pipe that one deck or two sheaf spaces are intersection or quadrature in the soil layer of heat insulation layer bottom.
On described condensation segment, helical fin is installed.
Beneficial effect of the present invention:
The present invention successfully is applied to the thermal siphon technology in the reinforcing of large tracts of land ground first, for the large-scale oil storage of tundra, the construction of gasholder and the construction of building provide guarantee, can significantly reduce capital investment and guarantee ground safety.
Method of the present invention is simple, easy construction, and speed is fast.Whole hardened system of the present invention is simple in structure, workable, especially temperature is even everywhere for feasible ground of the use of samming thermal siphon basal plane, thereby has guaranteed that its base stabilization is firm reliable, particularly the problem of building centre temperature instability.
The invention solves the difficult problem of the center position installation thermal siphon of large tracts of land ground, it can carry out freezing reinforcing to the frozen soil of ground center position, overcome the thermal siphon reinforcing scope and be no more than 6 meters restriction, expanded the application of thermal siphon, solved the reinforcing difficult problem of large area frozen earth foundation simultaneously, has small investment, effective advantage.
Description of drawings
Fig. 1 is a reinforcing schematic diagram of the present invention.
Fig. 2 is the present invention's structural representation that thermal siphon is arranged on the ground when using in large-scale oil storage tank.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, 2.
A kind of oil storage tank reinforcement means of large area frozen earth foundation, it may further comprise the steps:
At first, be reinforced foundation surface dig out 1～4 meter of matching with the oil storage tank bottom surface dark fill out the hole, prepare for finally forming fill stratum 7, heat insulation layer 6 and native sand bed 5 on the frozen soil foundation surface.
Secondly, insert in the frozen soil layer 4 by the evaporator section 101 of the interval of setting (as 4 meters * 4 meters) described filling out in the hole thermal siphon formula pipe 1 (totally 177), the condensation segment 102 that makes thermal siphon formula pipe 1 is from filling out the hole periphery and stretch out and making oil storage tank 2 arranged around, and every thermal siphon formula pipe 1 all has a tilting tube connector 103 that evaporator section 101 is linked to each other with condensation segment 102.
In the 3rd step, by 14 samming thermal siphons of each horizontal arrangement of vertical and horizontal formula pipe 3, and middle samming thermal siphon formula pipe 3 is the longest in the bottom of filling out the hole, and the closer to tank skin, the length of samming thermal siphon formula pipe 3 is short more.
In the 4th step, backfill sandy and stony soil and it is covered on the samming thermal siphon formula pipe 3 in filling out the hole forms native sand bed 5.
In the 5th step, on native sand bed 5, lay the heat insulation layer 6 that one deck is made by heat-barrier material (as polyurethane).
The last mixture of backfill sandstone material or backfill or sandstone material and backfill formation fill stratum 7 in filling out the hole again.
Be the description that example is carried out method of the present invention only below with the reinforcement means of an oil storage tank ground, but for a person skilled in the art fully can be according to the oil storage tank of above exemplary application in other specification, building, various pumps, stand, towers etc. are architectural different is can be according to realizing that needs carry out the variation and the choice of size, in ground, do not increase samming thermal siphon formula pipe as can specifically implement the time, do not set up native sand bed and heat insulation layer, tube connector 103 can not adopt measures such as evaporator section uneven distribution tilting and that make thermal siphon formula pipe, but these measures of taking still are believed to comprise among category of the present invention.
Be the description that example is carried out method of the present invention only below with the reinforcement means of an oil storage tank ground, but for a person skilled in the art fully can be according to the oil storage tank of above exemplary application in other specification, building, various pumps, stand, towers etc. are architectural, different is can be according to realizing that needs carry out the variation and the choice of size, in ground, do not increase the samming thermal siphon as can specifically implement the time, do not set up native sand bed and heat insulation layer, tube connector 103 can not adopt measures such as evaporator section uneven distribution tilting and that make thermal siphon, but these measures of taking still are believed to comprise among category of the present invention.
Below be based on the hardened system of a kind of large area frozen earth foundation of hot pin of the present invention.
As shown in Figure 1, 2.
A kind of large area frozen earth foundation hardened system, it is installed in the thermal siphon 1 that is reinforced on the ground by many at interval by setting and forms, being reinforced ground is made up of fill stratum 7 and frozen soil layer 4, frozen soil layer 4 is positioned at the bottom of fill stratum 7, described thermal siphon 1 is by being inserted into the evaporator section 101 that is reinforced in the ground frozen soil layer 4, be inserted into the condensation segment 102 of building (oil storage tank as shown in Figure 2) thermal siphon 1 on every side that is reinforced on the ground and connect evaporator section 101 and condensation segment 102 tilting in tube connector 103 (tube connector can only be arranged in fill stratum 7, also can only be arranged in frozen soil layer 4, also can pass fill stratum 7 and frozen soil layer 4) the composition (see figure 1).Tube connector 103 is tilting to be for condensate liquid is dropped in the evaporator section 101 under action of gravity naturally.In order to improve consolidation effect, the present invention also bottom in fill stratum 7 is provided with heat insulation layer 6, in the lower horizontal of heat insulation layer 6 one deck or two sheaf spaces is installed and is and intersects or the samming thermal siphon 3 of quadrature, as Fig. 2.In addition, in order to increase radiating effect, on being positioned at condensation segment 102 on the ground, thermal siphon also heat transmission helical fin or straight fins can be installed.
Be further described with the example that is applied as of the present invention in the oil storage tank ground stabilization below.
As shown in Figure 2, owing to be distributed with ever-frozen ground in the place, tank farm, more than 2.1 meters of the ever-frozen ground upper limit buried depths, lower limit to 16 meter, frozen soils temperature is-1.21～-1.95 ℃.Along with temperature raises, the face of land is destroyed and oil tank in crude oil to underground heat transfer etc., ever-frozen ground can produce degeneration, makes ground that thaw collapse may take place.Produce differential settlement if frozen soil melts, can cause that oil tank tilts, collapses.The present invention adopts the thermal siphon technology to prevent that place, tank farm ever-frozen ground from melting, and guarantees oil tank safety
The thermal siphon operating principle is: the evaporator section of thermal siphon is imbedded in the frozen soil layer, and the condensation segment of thermal siphon is positioned on the ground.Winter, the liquid working substance in the thermal siphon absorbed the heat in the frozen soil, flashes to gas when being lower than the frozen soil layer temperature when air themperature.When steam travelled up to the condensation segment of thermal siphon, steam was condensed into liquid at inside pipe wall, and the heat in the frozen soil is discharged to air.Liquid working substance flows back to evaporator section along tube wall and evaporates under action of gravity, and so circulation is transferred to the heat in the frozen soil layer in the atmosphere continuously, and the cold in the atmosphere is stored in the frozen soil, reduces the temperature of ever-frozen ground.Generally can reduce to-20 ℃.Summer, liquid stopped evaporation when being higher than the ever-frozen ground temperature when air themperature, and the heat in the atmosphere can not pass in the ever-frozen ground by thermal siphon.So thermal siphon utilizes the one-way heat conduction characteristic of heat pipe, can reduce subsurface temperature effectively, increase the cold reserves of frozen soil, it is loosening that permanent freezing layer also can not melted summer, guarantees the stable of ground.
As shown in Figure 2, on tank foundation, arrange two kinds of thermal siphons: freezing thermal siphon 1 and samming thermal siphon 3.Utilize the separating heat tube technology, the evaporator section of freezing thermal siphon is connected by a tube connector (straight tube or metal hose) with condensation segment, and evaporator section directly inserts the ever-frozen ground layer of tank bottom, condensation segment be arranged in oil tank around.Add one deck insulation layer (it is made up of heat insulation layer and native sand bed) in the bottom of backfill, reduce the downward heat output of crude oil.The samming thermal siphon of installing as figure layout level under insulation layer 3 that plays the samming effect, even temperature distributes to make soil layer keep relatively.The samming thermal siphon all is embedded in the sandy soil.
The thermal siphon spacing is 4 meters, totally 177 freezing thermal siphons and 28 samming thermal siphons.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (6)
1. the reinforcement means of a large area frozen earth foundation is characterized in that:
At first process 1～4 meter dark hole of filling out being reinforced the thing foundation surface;
Secondly insert in the frozen soil layer by the evaporator section of the interval of setting described filling out in the hole thermal siphon formula pipe, the condensation segment that makes thermal siphon formula pipe is from filling out the hole periphery and stretch out and make its arranged around of being built thing above ground, and every thermal siphon formula pipe is made up of evaporator section, tube connector and condensation segment and is
Shape structure, tube connector are positioned at the middle part of thermal siphon formula pipe, with tube connector will insert evaporator section and stretching out in the frozen soil layer fill out the condensation segment of hole periphery couple together form complete
Shape thermal siphon formula pipe;
The mixture of backfill sandstone material, backfill or sandstone material and backfill forms the sand bed that bankets in filling out the hole at last; Horizontal arrangement has two layers of samming thermal siphon formula pipe in the backfill sand bed, and described two layers of samming thermal siphon formula tube space intersect.
2. the reinforcement means of large area frozen earth foundation according to claim 1 is characterized in that the tube connector at described thermal siphon formula pipe middle part is tilting in filling out the hole.
3. the reinforcement means of large area frozen earth foundation according to claim 1 is characterized in that being provided with heat insulation layer in the bottom of filling out the hole, is provided with the backfill sand bed in the heat insulation layer bottom, and horizontal arrangement has samming thermal siphon formula pipe in the backfill sand bed.
4. large area frozen earth foundation automatic cooling-down temperature-averaging reinforcement system, it is installed in the thermal siphon formula pipe that is reinforced on the ground by many at interval by setting and forms, being reinforced ground is made up of fill stratum and frozen soil layer, frozen soil layer is positioned at the bottom of the sand bed that bankets, it is characterized in that described thermal siphon formula pipe is made up of the tube connector that is arranged in the sand bed that bankets that is inserted into the evaporator section that is reinforced in the ground frozen soil layer, is inserted into the condensation segment of the thermal siphon formula pipe around the building that is reinforced on the ground and connects evaporator section and condensation segment, every thermal siphon formula pipe is
Shape; Bottom in described fill stratum also is provided with heat insulation layer, is horizontally installed with the samming thermal siphon formula pipe that one deck or two sheaf spaces are intersection in the native sand bed of heat insulation layer bottom.
5. large area frozen earth foundation automatic cooling-down temperature-averaging reinforcement system according to claim 4 is characterized in that described tube connector is tilting layout, and tube connector is a flexible hose.
6. large area frozen earth foundation automatic cooling-down temperature-averaging reinforcement system according to claim 4 is characterized in that on described condensation segment helical fin being installed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810156945 CN101387110B (en) | 2008-09-19 | 2008-09-19 | Reinforcing method of large area frozen earth foundation building and automatic cooling-down temperature-averaging reinforcement system |
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| CN 200810156945 CN101387110B (en) | 2008-09-19 | 2008-09-19 | Reinforcing method of large area frozen earth foundation building and automatic cooling-down temperature-averaging reinforcement system |
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| CN101387110A CN101387110A (en) | 2009-03-18 |
| CN101387110B true CN101387110B (en) | 2011-03-23 |
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| CN101787692B (en) * | 2010-01-14 | 2012-08-29 | 中铁西北科学研究院有限公司 | Method for maintaining thermal stability of permafrost foundation and complete solar refrigeration device |
| CN101806058B (en) * | 2010-03-04 | 2011-06-22 | 中国科学院寒区旱区环境与工程研究所 | Freezing plate for cooling soil body and temperature control system |
| CN103469827A (en) * | 2013-09-06 | 2013-12-25 | 国家电网公司 | Tower base hot rod mounting technique in permafrost regions |
| CN107794817A (en) * | 2017-11-06 | 2018-03-13 | 固远晨通科技发展有限公司 | A kind of new permafrost area embankment structure |
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