CN110820786A

CN110820786A - Deep foundation structure for preventing freeze-thaw diseases in permafrost region

Info

Publication number: CN110820786A
Application number: CN201911139544.5A
Authority: CN
Inventors: 王青志; 胡坤; 徐安花; 晁刚; 祁文斌; 房建宏; 孙海秀; 韩东; 仲玮年; 李慧赞; 董铨基; 尹彦刚; 张绪军; 王丽娜; 刘磊; 薛兆锋; 马亮; 冶炯; 张兆弟
Original assignee: QINGHAI INSTITUTE OF TRANSPORTATION SCIENCE
Current assignee: Qinghai University
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-02-21
Anticipated expiration: 2039-11-19
Also published as: CN110820786B

Abstract

The invention discloses a deep foundation structure for preventing freeze-thaw diseases in permafrost regions, which comprises a deep foundation arranged in a frozen soil layer and a plurality of pipelines embedded outside the deep foundation, wherein moving blocks are arranged inside the pipelines, liquid is uniformly distributed at the lower ends of the moving blocks inside the pipelines, a heat insulation sleeve is sleeved outside the pipelines, more than one extrusion plate is distributed between the heat insulation sleeve and the pipelines in an annular structure, first springs are arranged at the upper ends of the moving blocks, the upper ends of the first springs are arranged on the top surface inside the pipelines, a fixing ring is poured and fixed at the upper end of the deep foundation, and extrusion mechanisms are arranged between the fixing ring and the pipelines. The invention has simple structure, can extrude the soil around the deep foundation by the cold expansion and thermal shrinkage principle of water, thereby greatly reducing the generation of gaps and increasing the density of the soil around the deep foundation, and can extrude the pipeline to one end of the deep foundation by the second spring, thereby further increasing the extrusion effect.

Description

Deep foundation structure for preventing freeze-thaw diseases in permafrost region

Technical Field

The invention relates to the technical field of deep foundation structures, in particular to a deep foundation structure for preventing diseases from being frozen and melted in a permafrost region.

Background

With the implementation of a series of important national policies such as the major development in the western part of China, the joy of old industrial bases in northeast China and the like, a large number of civil engineering works are planned and constructed in permafrost regions (about 21.5% of the area of the national soil, mainly distributed in the northeast part of inner Mongolia, Heilongjiang, Xinjiang, Qinghai-Tibet plateau and the like) in China, such as Qinghai-Tibet highways, Qinghai-Tibet railways, Qinghai-Tibet direct current transmission and transformation networking projects, China Russian oil pipelines, Huliao direct current transmission and transformation projects, and the Qinghai-Tibet highways and China Mongolia power networking projects. The existence of these engineering buildings will significantly affect the thermal state of the frozen soil foundation at the lower part, cause the degradation and even melting of the frozen soil, lead to the reduction of the strength of the frozen soil foundation, and further may cause significant and even disastrous effects on the stability of the engineering buildings.

Because the deep foundation structure is deep into the permafrost, the existence of the deep foundation causes the heat exchange process between the external environment and the permafrost to be quicker relative to a road bed, and the heat influence strength of the deep foundation on the permafrost is larger. Therefore, the basic thermal stability is the key to determine the engineering stability and service performance. In rock strata or soil layers of frozen soil areas, cracks and pores with different sizes exist, the cracks and the pores are filled with water, and the water is gradually frozen and expanded along with the reduction of the temperature in winter and at night, so that surrounding rocks are greatly damaged, and the cracks are continuously enlarged. During summer or daytime, the ice melts due to temperature rise, and surface water can be injected again in the gap. The freezing and melting processes caused by the periodic change of the solid temperature alternately occur, and the ground soil (rock) layer is broken and loosened.

Disclosure of Invention

The invention aims to solve the technical problem of providing a deep foundation structure for preventing freeze-thaw diseases in permafrost areas so as to solve the problems in the background technology.

The invention is realized by the following technical scheme: a deep foundation structure for preventing freeze-thaw diseases in permafrost regions comprises a deep foundation installed in a frozen soil layer and a plurality of pipelines pre-buried outside the deep foundation, wherein the pipelines are of annular structures and are uniformly distributed outside the deep foundation, the upper end and the lower end of each pipeline are hermetically arranged, a moving block is arranged inside each pipeline, the outer ring surface of each moving block is in contact with the inner wall surface of each pipeline, liquid is uniformly distributed at the lower end of each moving block inside each pipeline, a heat insulation sleeve is sleeved outside each pipeline, more than one extrusion plate is distributed between each heat insulation sleeve and each pipeline in an annular structure, more than one shaft hole is formed in the outer wall surface of the upper end of each pipeline, a shaft rod is arranged inside each shaft hole, one end of each shaft rod extends into each pipeline, one end of each shaft rod inside each pipeline is arranged in a hemispherical structure, the other end of each shaft rod is welded and fixed on the inner side surface, first springs are installed at the upper ends of the moving blocks, the upper ends of the first springs are installed on the top surface inside the pipeline, a fixing ring is poured and fixed at the upper end of the deep foundation, and extrusion mechanisms are installed between the fixing ring and the pipeline.

As preferred technical scheme, the extrusion mechanism all includes horizontal pole, slider, spliced pole and second spring, and on the equal welded fastening of horizontal pole one end was fixed in solid fixed ring, all was equipped with a spout on the horizontal pole bottom surface, and on the equal welded fastening of spliced pole lower extreme was in the pipeline, the equal welded fastening of slider was in the upper end of spliced pole, and slider one end slidable mounting is in the spout, and the equal welded fastening of second spring is in the outside of slider, and the other end of second spring all welded fastening is on the internal face of spout.

As the preferred technical scheme, the heat insulation sleeve is made of elastic heat insulation materials, and a layer of elastic waterproof coating is uniformly coated on the outer wall of the heat insulation sleeve.

As preferred technical scheme, slider and spout all are the setting of dovetail structure, all interference connection between the two.

Preferably, the liquid is water.

The invention has the beneficial effects that: the invention has simple structure, and water inside the pipeline is frozen to increase the volume by the cold expansion and thermal shrinkage principle of water in winter, so that the movable block is jacked upwards, the extrusion plate can be jacked outwards by lifting the movable block, and the surrounding soil and rocks can be effectively extruded by the extrusion plate, so that the original gap is formed by extrusion, the generation of the gap is greatly reduced, the concentration degree of the soil around the deep foundation is also increased, the pipeline can be extruded towards one end of the deep foundation by the second spring, and the extrusion effect is further increased.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a partially enlarged view of a portion a in fig. 1.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can, for example, be fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 and 2, the freeze-thaw damage prevention deep foundation structure for the permafrost region comprises a deep foundation 1 installed in a frozen soil layer and a plurality of pipelines 8 embedded outside the deep foundation, wherein the pipelines 8 are in an annular structure and uniformly distributed outside the deep foundation 1 (namely, soil around the deep foundation is surrounded by the pipelines in an annular shape), the upper end and the lower end of each pipeline 8 are hermetically arranged, a moving block 11 is arranged inside each pipeline 8, the outer ring surface of each moving block 11 is in contact with the inner wall surface of each pipeline 8, liquid 12 is uniformly distributed at the lower end of each moving block 11 inside each pipeline 8, a heat insulation sleeve 10 is sleeved outside each pipeline 8, more than one extrusion plate 9 is distributed between each heat insulation sleeve 10 and each pipeline 8 in an annular structure, more than one shaft hole is arranged on the outer wall surface at the upper end of each pipeline 8, a shaft lever 14 is arranged inside each shaft hole, one end of each shaft lever 14 extends into each pipeline 8, the one end that axostylus axostyle 14 is located pipeline 8 inside all is the setting of hemispherical structure, the other end welded fastening is on the medial surface of stripper plate 9, the lateral surface of stripper plate 9 all is fixed with the internal face adhesion of radiation shield 10, first spring 13 is all installed to the upper end of movable block 11, first spring 13 upper end is all installed on the inside top surface of

pipeline

8, 1 upper end of deep basis is pour fixed solid fixed ring 2, gu all install squeezing mechanism between fixed ring 2 and the pipeline 8, wherein, soil around the deep basis is surrounded by the pipeline be the annular form, make soil around the deep basis spacing by the pipeline, can not cause inside gap to enlarge because of freezing, can only under the effect of stripper plate, soil extrudees inwards, the effectual gap pressfitting with in the soil.

In this embodiment, the extrusion mechanism all includes horizontal pole 3, slider 5, spliced pole 7 and second spring 6, 3 one ends of horizontal pole all welded fastening on solid fixed ring 2, all be equipped with a spout 4 on the 3 bottom surfaces of horizontal pole, the equal welded fastening of spliced pole 7 lower extreme is on pipeline 8, the equal welded fastening of slider 5 is in the upper end of spliced pole 7, 5 one end slidable mounting of slider are in spout 4, the equal welded fastening of second spring 6 is in the outside of slider 5, the equal welded fastening of the other end of second spring 6 is on the internal face of spout 4.

In this embodiment, the heat insulating sleeve 10 is made of an elastic heat insulating material, so as to reduce the melting speed of water inside the pipeline, and a layer of elastic waterproof coating is uniformly coated on the outer wall of the heat insulating sleeve.

In this embodiment, slider 5 and spout 4 all are the setting of dovetail structure, and equal interference connection has avoided the slider to follow the spout in the slider roll-off between the two.

In this embodiment, the liquid 12 is water, which is capable of cold expansion and heat shrinkage.

When winter, the inside water of pipeline can be caused to freeze by external temperature, thereby the volume has been increased, unnecessary volume can extrude the movable block, make the movable block upwards remove, the movable block can outwards push the axostylus axostyle after rising, the removal of axostylus axostyle has driven the stripper plate, the stripper plate through outwards pushing out can effectual extrusion soil around, thereby with the gap pressfitting in soil, great reduction the production in gap, the volume that the surface water got into when having reduced hot, the effect of melting and sinking has also been reduced, the security of deep foundation has been increased.

Wherein, when the sweltering heat, ice can melt water, at this moment, under the bounce of first spring, the movable block can get back to the normal position, and the outside thrust of stripper plate can disappear, at this moment, the effect at the second spring is in, can promote the slider inwards movement, and the removal of slider has driven the pipeline, makes the pipeline can inwards extrude, can not influence the soil around the deep basis because of the weather is hot, further increase the extrusion effect, increased the security.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims

1. The utility model provides a deep foundation structure of freeze thawing disease is prevented in permafrost region which characterized in that: the pipeline structure comprises a deep foundation arranged in a frozen soil layer and a plurality of pipelines pre-buried outside the deep foundation, wherein the pipelines are in an annular structure and are uniformly distributed outside the deep foundation, the upper end and the lower end of each pipeline are hermetically arranged, a moving block is arranged inside each pipeline, the outer ring surface of each moving block is in contact with the inner wall surface of each pipeline, the lower ends of the moving blocks inside each pipeline are uniformly filled with liquid, a heat insulation sleeve is sleeved outside each pipeline, more than one extrusion plate is arranged between each heat insulation sleeve and each pipeline in an annular structure, more than one shaft hole is arranged on the outer wall surface of the upper end of each pipeline, a shaft rod is arranged inside each shaft hole, one end of each shaft rod extends into each pipeline, one end of each shaft rod, which is positioned inside each pipeline, is in a hemispherical structure, the other end of each extrusion plate is welded and fixed on the inner side surface of, first spring upper end all installs on the inside top surface of pipeline, and a fixed solid fixed ring is pour to deep foundation upper end, all installs extrusion mechanism between solid fixed ring and the pipeline.

2. The deep infrastructure of a permafrost region for freeze-thaw disease prevention according to claim 1, further comprising: the extrusion mechanism comprises a transverse rod, a sliding block, a connecting column and a second spring, one end of the transverse rod is welded and fixed on the fixing ring, a sliding groove is formed in the bottom surface of the transverse rod, the lower end of the connecting column is welded and fixed on the pipeline, the sliding block is welded and fixed on the upper end of the connecting column, one end of the sliding block is slidably mounted in the sliding groove, the second spring is welded and fixed on the outer side of the sliding block, and the other end of the second spring is welded and fixed on the inner wall surface.

3. The deep infrastructure of a permafrost region for freeze-thaw disease prevention according to claim 1, further comprising: the heat insulating sleeve is made of elastic heat insulating material, and a layer of elastic waterproof paint is uniformly coated on the outer wall of the heat insulating sleeve.

4. The deep substructure of claim 2, wherein the deep substructure comprises: the sliding block and the sliding groove are both arranged in a dovetail structure and are in interference connection.

5. The deep infrastructure of a permafrost region for freeze-thaw disease prevention according to claim 1, further comprising: the liquid is water.