CN108130900B - Vertical energy-saving freezer and method for forming annular freezing wall - Google Patents
Vertical energy-saving freezer and method for forming annular freezing wall Download PDFInfo
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- CN108130900B CN108130900B CN201711430824.2A CN201711430824A CN108130900B CN 108130900 B CN108130900 B CN 108130900B CN 201711430824 A CN201711430824 A CN 201711430824A CN 108130900 B CN108130900 B CN 108130900B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
- E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
Abstract
The invention discloses a vertical energy-saving freezer forming an annular freezing wall, which comprises an inner freezing pipe and an outer pressure-bearing pipe, wherein the inner freezing pipe comprises a heat-insulating section freezing pipe and a non-heat-insulating section freezing pipe, and the pipe diameter of the heat-insulating section freezing pipe is smaller than that of the non-heat-insulating section freezing pipe; the heat insulation section freezing pipe and the non-heat insulation section freezing pipe are connected through a reducing joint, and a first outer coupling is wrapped and welded outside the reducing joint; the outer surface of the heat insulation section freezing pipe is laid with a first heat insulation layer, and the first outer hoop is welded to the outer layer pressure-bearing pipe; the non-heat-insulation section freezing pipes are laid in the annular freezing area, and the heat-insulation section freezing pipes are laid outside and inside the ring of the annular freezing area, so that an annular freezing wall is formed. The invention can not only realize the freezing of the bottom of the structure of the excavation structure, but also avoid freezing the section to be excavated to be solid, namely forming an annular frozen wall, thereby not only realizing energy conservation, but also reducing the damage of frost heaving and thaw collapse caused by the freezing of the full section.
Description
Technical Field
The invention relates to a vertical energy-saving freezer and a method for forming an annular freezing wall.
Background
The freezing method is an artificial refrigeration technology and is developed from natural freezing. The special construction technology for reinforcing the stratum is widely applied to the construction of mines, tunnels, subways and related municipal works in various countries in the world, and becomes one of important construction methods for underground engineering construction.
The freezing method is a special construction method for providing a safe temporary support for sinking a well by establishing a frozen soil curtain which can improve the soil strength and is sealed and waterproof in the stratum. The domestic freezing construction selects a reasonable freezing design scheme according to the shape and development mode of an underground structure. At present, the coal mine vertical shaft freezing project generally adopts a single-circle or multi-circle hole vertical freezing mode; the freezing project of the inclined shaft of the coal mine usually adopts a sectional vertical hole local freezing scheme; municipal communication or tunnel freezing projects typically employ a horizontal freezing scheme. When the vertical freezing scheme is adopted for construction, the external load which is mainly water and soil pressure and needs to be resisted by the freezing wall is continuously increased along with the increase of the freezing depth. The freezing design is usually carried out on the basis of the thickness of the freezing wall of the control layer position, the freezing of other layer positions or the freezing sections is not needed to bring the loss of freezing cold quantity, and the heat insulation effect of the freezing device for the excavation section is not considered, so that the excavation lining difficulty of the excavation section is increased, and the environmental effect caused by the increase of the frozen soil quantity is increased.
According to the field working condition, sometimes vertical freezing is needed to reinforce a horizontal or nearly horizontal underground structure, generally, a vertical freezing hole is drilled on the ground, the underground structure is frozen in a full scale, a structure to be built and a surrounding soil body are frozen into a frozen soil block, and then the frozen soil block is excavated to build the underground structure. According to the freezing method, during excavation, frozen soil needs to be excavated on the full section, the excavation difficulty is high, the construction period is long, and extra consumption is caused; meanwhile, the excavated soil body is frozen and compacted, so that the cold loss and the resource waste are objectively caused, and the environment is not protected; the large-volume full-scale freezing is easy to generate larger frost heaving and thawing sinking, which endangers the engineering safety.
Therefore, it is necessary to research an energy-saving vertical freezer and a method for forming an annular freezing wall.
The method is characterized in that a vertical freezing hole is adopted for freezing and reinforcing a horizontal structure, a freezing wall with a certain thickness in a surrounding shape is formed at the periphery of a proposed building or a structure according to a freezing design theory, the upper part and two sides of the proposed building can be frozen by directly arranging the vertical or near-vertical freezing holes from the ground, the bottom can be realized only by arranging the vertical or near-vertical freezing holes penetrating through the inside of the structure, but the saline water circulation freezing at the bottom of the structure is realized, and meanwhile, the inside area of the structure to be excavated is frozen.
Disclosure of Invention
The invention aims to solve the technical problems that the horizontal freezing pore-forming construction of the existing long-distance curve tunnel construction is difficult and the requirement on frost heaving and thawing sinking is high.
In order to achieve the above objects, in one aspect, the present invention provides a vertical energy-saving freezer forming an annular freezing wall, comprising an inner freezing pipe and an outer pressure-bearing pipe, wherein the inner freezing pipe comprises a heat insulation section freezing pipe and a non-heat insulation section freezing pipe, and the pipe diameter of the heat insulation section freezing pipe is smaller than that of the non-heat insulation section freezing pipe;
the heat insulation section freezing pipe and the non-heat insulation section freezing pipe are connected through a reducing joint, and a first outer coupling is wrapped and welded outside the reducing joint;
the outer surface of the heat insulation section freezing pipe is laid with a first heat insulation layer, and the first outer hoop is welded to the outer layer pressure-bearing pipe;
the non-heat-insulation section freezing pipes are laid in the annular freezing area, and the heat-insulation section freezing pipes are laid outside and inside the ring of the annular freezing area, so that an annular freezing wall is formed.
Further, reducer union one end is installed through first inner coupling the thermal-insulated section freezes intraductally, the reducer union other end is installed through second inner coupling the thermal-insulated section freezes intraductally, the thermal-insulated section freezes the end inner wall of pipe and has seted up first recess, the thermal-insulated section freezes the end inner wall of pipe and has seted up the second recess, set up in the first recess first inner coupling, set up in the second recess coupling in the second, first inner coupling and second inner coupling respectively with the reducer union welding is in the same place.
Further, the first heat insulation layer is made of polyethylene materials.
Further, the outer pressure-bearing pipe is a seamless steel pipe.
In another aspect, the present invention provides a method of forming an annular frozen wall by a vertical energy-saving freezer, comprising the steps of:
(1) respectively determining the pipe diameters of the inner-layer freezing pipes of the heat insulation section and the non-heat insulation section, wherein the pipe diameter of the inner-layer freezing pipe of the heat insulation section is smaller than that of the inner-layer freezing pipe of the non-heat insulation section, and the inner-layer freezing pipe of the heat insulation section is connected with the inner-layer freezing pipe of the non-heat insulation section through a reducer union;
(2) determining the thickness of a heat insulation layer;
(3) selecting a seamless steel pipe as an outer pressure-bearing pipe;
(4) numbering the inner freezing pipes of the heat insulation sections, winding a heat insulation layer material on the surfaces of the numbered inner freezing pipes of the heat insulation sections by using an adhesive tape, ensuring that the heat insulation layer material is tightly contacted with the inner freezing pipes of the heat insulation sections in the winding process, and sleeving the outer pressure bearing pipes on the outer surfaces of the inner freezing pipes after the heat insulation layer material is wound;
(5) freezing holes are formed in the periphery of the section to be excavated, wherein non-heat-insulation section inner-layer freezing pipes are arranged in the freezing holes in an annular region around the section to be excavated, and heat-insulation section inner-layer freezing pipes are arranged in the freezing holes in the outer ring and the inner ring of the annular region;
(6) and injecting frozen brine into the inner freezing pipe, wherein the soil layer around the inner freezing pipe of the heat insulation section is not frozen, and the soil layer around the inner freezing pipe of the heat insulation section is frozen, so that an annular freezing wall is formed in the annular region.
Compared with the prior art, the invention has the beneficial effects that:
the invention can realize the freezing of the bottom of the structure of the excavation structure, and avoid freezing the section to be excavated to be solid, namely forming an annular frozen wall, thereby not only realizing energy conservation, but also reducing the damage of frost heaving and thaw settlement caused by full section freezing, realizing high-efficiency excavation, and finally realizing friendly cooperation with the surrounding environment.
Drawings
FIG. 1 is a radial cross-sectional view of a freezing tube portion of an insulation section of a freezer of the present invention;
FIG. 2 is an axial cross-sectional view of a freezing tube portion of an insulation section of the freezer of the present invention;
FIG. 3 is an axial cross-sectional view of a freezing tube section of an insulation section of a freezer of the present invention after welding two adjacent insulation section freezing tubes;
FIG. 4 is an axial cross-sectional view taken from FIG. 3, after thermal insulation and outer ferrule welding at the weld joint;
FIG. 5 is a schematic view of annular frozen wall formation;
FIG. 6 is a schematic view of the connection of the insulated section freezing tube and the uninsulated section freezing tube by a reducer union.
In the figure: an inner layer freezing pipe 1; a first insulating layer 2; an outer pressure-bearing pipe 3; sealing the annular blank plate 4; a first weld seam 5; a second insulating layer 6; a second outer collar 7; a reducer union 8; a first inner collar 9; a second inner collar 10; a second weld 11; a third weld 12; an annular frozen wall outer boundary 13; an annular frozen wall inner boundary 14; an uninsulated section freezing tube 15; the insulation segment freezes the tube 16.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1-6, the vertical energy-saving freezer forming the annular freezing wall of the invention comprises an inner freezing pipe 1 and an outer pressure-bearing pipe 3, wherein the inner freezing pipe 1 comprises a heat insulation section freezing pipe 16 and a non-heat insulation section freezing pipe 15, and the pipe diameter of the heat insulation section freezing pipe 16 is smaller than that of the non-heat insulation section freezing pipe 15;
the heat insulation section freezing pipe 16 and the non-heat insulation section freezing pipe 15 are connected through a reducer union 8, and a first outer coupling (not shown in the figure) is wrapped and welded outside the reducer union;
the outer surface of the heat insulation section freezing pipe is laid with a first heat insulation layer 2, and a first external hoop is welded to an outer layer pressure-bearing pipe 3; the annular space between the outer layer pressure-bearing pipe 3 and the inner layer freezing pipe 1 is welded and sealed through a sealing annular blank plate 4;
an uninsulated section freezing tube 15 is laid in the annular freezing zone between outer boundary 13 and inner boundary 14, and an insulated section freezing tube 16 is laid in the annulus (i.e., outside outer boundary 13) and in the annulus (i.e., inside inner boundary 14) of the annular freezing zone to form an annular freezing wall. As shown in fig. 3-4, the heat insulation section freezing pipe 16 is formed by welding multiple sections, two adjacent sections are connected together through a circle of first welding seam 5, the outer surfaces of the heat insulation section freezing pipes 16 around the first welding seam 5 are wrapped with second heat insulation layers 6, and the outer surfaces of the second heat insulation layers 6 are welded and sealed with the outer pressure bearing pipe 3 through second outer collars 7.
Preferably, one end of the reducer union 8 is installed in the heat insulation section freezing pipe through a first inner coupling 9, the other end of the reducer union is installed in the heat insulation section freezing pipe through a second inner coupling, a first groove is formed in the inner wall of the end of the heat insulation section freezing pipe, a second groove is formed in the inner wall of the end of the heat insulation section freezing pipe, the first inner coupling is arranged in the first groove, the second inner coupling is arranged in the second groove, and the first inner coupling and the second inner coupling are welded with the reducer union respectively.
The process of connecting the heat-insulating section freezing pipe 16 and the non-heat-insulating section freezing pipe 15 through the reducer union 8 is described by taking the seamless steel pipe with the specification phi 89 x 8 (the outer diameter is 89mm, the wall thickness is 8mm, and the inner diameter is 73mm), the outer pressure-bearing pipe with the specification 133 x 4, and the seamless steel pipe with the specification phi 133 x 8 (the outer diameter is 133mm, and the wall thickness is 8mm) as an example, as shown in fig. 6:
(1) a first groove (not shown in the figure) for placing a first inner coupling 9 is machined in the inner wall of the end head of the phi 89 x 8 seamless steel pipe, the length of the first groove is 50mm, the groove depth is 0.5mm, and after the first groove is machined, the inner diameter of the heat insulation section freezing pipe 16 is changed to 74 mm. In order to facilitate welding and ensure welding quality, a groove of 63 degrees is formed in the outer side wall of the 16 end part of the heat insulation section freezing pipe in a thickness of 6mm, and in order to facilitate alignment, a groove is not formed in the inner side wall in a thickness of 2 mm. The first inner collar 9 is made of phi 76 x 5 seamless steel tubes, the length is 115mm, the outer side wall with the length of 50mm at two ends is cut off by 1mm, after the outer diameter of the two ends of the first inner collar 9 is changed to 74mm, and the first inner collar can be just inserted into the first groove of the heat insulation section freezing tube 16. A rib with the width of 2mm and the thickness of 1.5mm is reserved in the middle of the first inner coupling 9, and a first trapezoidal groove is formed between the rib and the end face of the heat insulation section freezing pipe 16 and between the rib and the end face of the variable diameter joint phi 89 and phi 8.
(2) The end of the phi 133 x 8 seamless steel pipe is provided with a second groove (not shown in the figure) for placing a second inner coupling 10, the length of the second groove is 50mm, the depth of the groove is 0.5mm, the inner diameter of the freezing pipe of the non-heat-insulation section is changed into 118mm after the second groove is processed, for facilitating welding and ensuring the welding quality, a groove of 63 degrees is arranged on the outer side wall of the end part of the freezing pipe of the heat-insulation section in a thickness of 6mm, and for facilitating alignment, a groove is not arranged on the inner side wall in a thickness of 2 mm. The second inner coupling 10 is manufactured by adopting a phi 120 x 5 seamless steel pipe, the length is 115mm, the outer side wall with the length of 50mm at two ends is cut to have the thickness of 1mm, after the outer diameter of the two ends of the second inner coupling 10 is changed to 118mm, and the second inner coupling can be just inserted into a second groove of the non-heat-insulation section freezing pipe 15. And a rib with the width of 2mm and the thickness of 1.5mm is reserved in the middle of the second inner coupling 10, and a second trapezoidal groove is formed between the rib and the end surface of the non-heat-insulation section freezing pipe 15 and between the rib and the end surface of the variable-diameter joint phi 133 and phi 8.
(3) And (3) machining a phi 89X 8-to-phi 133X 8 seamless steel pipe reducer joint 8, wherein the length of the reducer joint 8 is 500mm, the length of a phi 89X 8 section is 150mm, the length of a phi 133X 8 section is 150mm, and the length of the reducer is 200 mm.
(4) Welding the phi 89 x 8 heat insulation section freezing pipe 16 and the variable diameter phi 89 x 8 end through a first inner coupling 9, and respectively welding a rib of the first inner coupling 9 with a first trapezoid groove between the phi 89 x 8 heat insulation section freezing pipe 16 and the variable diameter phi 89 x 8 end to form a circle of second welding line 11;
and the phi 133 and 8 non-heat-insulation freezing pipe 15 and the phi 133 and 8 variable-diameter end are welded through a second inner coupling 10, and ribs of the second inner coupling 10 are respectively welded with the phi 133 and 8 non-heat-insulation freezing pipe 15 and a second trapezoidal groove between the phi 133 and 8 variable-diameter ends to form a circle of third welding seams 12. Through the trapezoidal groove welding, the welding plane has three faces, fully guarantees welding quality.
(5) The outside of the reducing joint 8 is welded and wrapped by a first external collar (not shown) with the specification of phi 133 x 4, so that the influence of formation frost heaving on the reducing joint 8 is avoided.
Preferably, the first and second insulating layers 2, 6 are both of polyethylene material.
Preferably, the outer pressure-bearing pipe 3 is a seamless steel pipe.
The invention discloses a method for forming an annular frozen wall by a vertical energy-saving freezer, which comprises the following steps: (1)
respectively determining the pipe diameters of freezing pipes in a heat insulation section and a non-heat insulation section, wherein the pipe diameter of the freezing pipe in the inner layer of the heat insulation section
The diameter of the freezing pipe is smaller than that of the freezing pipe at the inner layer of the non-heat-insulation section, and the freezing pipe at the inner layer of the heat-insulation section and the freezing pipe at the inner layer of the non-heat-insulation section are frozen
The pipes are connected through reducing joints;
(2) determining the thickness of a heat insulation layer;
(3) selecting a seamless steel pipe as an outer pressure-bearing pipe;
(4) numbering the inner freezing pipes of the heat insulation sections, winding a heat insulation layer material on the surfaces of the numbered inner freezing pipes of the heat insulation sections by using an adhesive tape, ensuring that the heat insulation layer material is tightly contacted with the inner freezing pipes of the heat insulation sections in the winding process, and sleeving outer pressure bearing pipes on the outer surfaces of the inner freezing pipes after the heat insulation layer material is wound;
(5) freezing holes are formed in the periphery of the section to be excavated, wherein non-heat-insulation section inner layer freezing pipes are arranged in the freezing holes in an annular region around the section to be excavated, and heat-insulation section inner layer freezing pipes are arranged in the freezing holes in the outer ring and the inner ring of the annular region;
(6) and injecting frozen brine into the inner freezing pipe, wherein the soil layer around the inner freezing pipe of the heat insulation section is not frozen, and the soil layer around the inner freezing pipe of the heat insulation section is frozen, so that an annular freezing wall is formed in the annular region.
Specifically, the design and construction are carried out according to the following procedures:
insulation of freezing pipe of insulation section
The heat exchange between a low-temperature medium and the surrounding environment is reduced, and a layer of heat insulation material with a smaller heat conductivity coefficient is covered on the surface of the inner freezing pipe of the ineffective freezing section by a proper heat insulation structure, so that the freezing device has important significance for reducing the loss of cold energy, the freezing effect of the freezing section and the freezing cost.
(1) Determining the size of the aperture of the inner-layer freezing pipe according to the design requirement;
(2) calculating the thickness of the heat insulation layer: according to the economic thickness calculation formula of the cylindrical surface heat insulation layer, substituting parameters by combining with freezing design and engineering requirements to calculate the thickness of the heat insulation layer:
in the formula:
-insulation layer thickness in (m);
fn-heat value in units of units per giga-joules (units/GJ);
lambda-thermal conductivity of the insulation product, the thermal conductivity of the soft material under the installation density being taken
The bit is in watts per meter kelvin [ W/(m.k) ];
τ -annual running time in hours (h);
t-the outside surface temperature of the equipment and piping in Kelvin (degrees Celsius) [ K (deg.C) ];
nambient temperature in Kelvin (degrees Celsius) [ K (DEG C.)]；
PiUnit cost of insulation structure in units of units per cubic meter (units/m)3)；
S-annual investment and loan allocation rate of heat insulation project, interest is calculated according to the profit
i-annual rate (recyclability);
n-number of years of rest;
α heat exchange coefficient between the outer surface of the heat-insulating layer and atmosphere, its unit is Kelvin per square meter W/square meter K
(3) The selection of the heat insulation layer integrates the characteristics of economy, performance, process and the like, and the polyethylene plastic material is selected to replace the traditional vacuum heat insulation layer and the polyurethane foaming agent.
(4) Selecting an outer-layer pressure-bearing pipe: the pressure-bearing pipe of traditional technology mainly selects the polyethylene pipe, and this tubular product has low heat conduction, light characteristic, but its material rigidity is relatively poor, can appear warping under great soil and water pressure condition, and the unable sealing connection of polyethylene pipe as the pressure-bearing pipe, consequently can cause the water in the soil layer to get into the insulating layer, finally loses thermal-insulated effect along with the extension of time. The method selects the seamless steel pipe as the outer pressure-bearing pipe, can effectively resist the water and soil pressure in the soil layer, and the seamless steel pipe can be connected in a sealing way, so that water in the stratum can not enter the heat insulation layer, and the heat insulation effect can not fail.
(5) Construction of a heat insulation layer: firstly, according to the design of a freezing hole, arranging an inner-layer freezing pipe, numbering the freezing pipes needing heat insulation, then winding a polyethylene plastic material on the surface of the freezing pipe by using an adhesive tape, ensuring that a heat insulation material is tightly connected with the freezing pipe in the winding process, and sleeving an outer-layer pressure-bearing pipe after the heat insulation material is wound.
Preferably, the sealing of the heat insulation layer is divided into two steps, wherein the outer pressure-bearing pipe and the heat insulation section freezing pipe are welded and sealed through a sealing annular blank plate 4, and the outer hoop is used for welding and sealing after the welding joint of the freezing pipe is heat-insulated, so that the heat insulation layer cannot enter water and cannot lose efficacy in the freezing process.
Preferably, after the freezing pipe is welded, when the polyethylene plastic pipe is tangled at the welding port, the port needs to be cooled completely, so that the damage to the material and the influence on the heat insulation effect are prevented.
(II) connection of freezing pipe of heat insulation section and freezing pipe of non-heat insulation section
In the freezing engineering, the safety and the reliability of the freezer are very critical, and particularly, after the freezing pipe buried underground is broken, salt water can be caused to be lost into the stratum, the freezing point of frozen soil is reduced, the strength of the frozen soil is weakened, and even freezing failure can be caused. The freezing pipe can be embrittled in a low-temperature state, meanwhile, the freezing pipe is influenced by frost heaving in the freezing process, the freezing pipe is influenced by shearing force, and particularly, the joint of a freezing area and a heat insulation area is subjected to larger shearing force, so that reliable connection is particularly important.
The connecting joint adopts inner coupling connection, the inner coupling and two ends to be connected are precisely machined, different pipe diameters are connected, and the butt joint positions are connected by welding. Specific joining processes have been described above in detail by way of example.
(III) the freezer is put down into the freezing hole
Uninsulated section freezing tubes 15 are laid in the annular freezing zone between outer boundary 13 and inner boundary 14, and insulated section freezing tubes 16 are laid in the annulus of the annular freezing zone (i.e., outside outer boundary 13) and in the annulus (i.e., inside inner boundary 14).
(IV) injecting frozen brine into the inner layer freezing pipe to form an annular freezing wall
Wherein the soil layer around the inner freezing pipe of the adiabatic section is not frozen, the soil layer around the inner freezing pipe of the uninsulated section is frozen, and an annular freezing region between an outer boundary 13 and an inner boundary 14 forms an annular freezing wall.
On the basis of the existing freezing design, the invention adopts more economical, light and effective polyethylene plastic materials for heat insulation to replace polyurethane foaming agents, and simultaneously adopts seamless steel pipes to replace the original polyethylene pipes as outer-layer pressure-bearing pipes, thereby solving the problems of flattening deformation and sealing of the pressure-bearing pipes in deeper strata, ensuring that the heat insulation layer cannot deform and water can not enter in the whole freezing process, effectively solving the problem of heat insulation failure of the original heat insulation freezing pipes, and further effectively reducing frost heaving of the strata and the problem of interference to the surrounding environment.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations are within the scope of the present invention.
Claims (3)
1. The vertical energy-saving freezer is characterized by comprising an inner freezing pipe and an outer pressure-bearing pipe, wherein the inner freezing pipe comprises a heat insulation section freezing pipe and a non-heat insulation section freezing pipe, and the pipe diameter of the heat insulation section freezing pipe is smaller than that of the non-heat insulation section freezing pipe;
the heat insulation section freezing pipe and the non-heat insulation section freezing pipe are connected through a reducing joint, and a first outer coupling is wrapped and welded outside the reducing joint;
the outer surface of the heat insulation section freezing pipe is laid with a first heat insulation layer, and the first outer hoop is welded to the outer layer pressure-bearing pipe; the outer-layer pressure-bearing pipe is a seamless steel pipe;
the non-heat-insulation section freezing pipes are laid in an annular freezing area, and the heat-insulation section freezing pipes are laid outside and inside the ring of the annular freezing area, so that an annular freezing wall is formed;
reducing joint one end is installed through first inner coupling the thermal-insulated section freezes intraductally, the reducing joint other end is installed through second inner coupling the thermal-insulated section freezes intraductally, first recess has been seted up to the end inner wall that the thermal-insulated section freezes the pipe, the second recess has been seted up to the end inner wall that the thermal-insulated section freezes the pipe not, set up in the first recess first inner coupling, set up in the second recess second inner coupling, first inner coupling and second inner coupling respectively with the reducing joint welding is in the same place.
2. The vertical energy efficient freezer forming an annular freezing wall of claim 1, wherein the insulation layer is a polyethylene material.
3. A method of forming an annular frozen wall with a vertical energy efficient freezer comprising the steps of:
(1) respectively determining the pipe diameters of the inner-layer freezing pipes of the heat insulation section and the non-heat insulation section, wherein the pipe diameter of the inner-layer freezing pipe of the heat insulation section is smaller than that of the inner-layer freezing pipe of the non-heat insulation section, and the inner-layer freezing pipe of the heat insulation section is connected with the inner-layer freezing pipe of the non-heat insulation section through a reducer union; one end of the reducer union is installed in the heat insulation section freezing pipe through a first inner coupling, the other end of the reducer union is installed in the non-heat insulation section freezing pipe through a second inner coupling, a first groove is formed in the inner wall of the end head of the heat insulation section freezing pipe, a second groove is formed in the inner wall of the end head of the non-heat insulation section freezing pipe, the first inner coupling is arranged in the first groove, the second inner coupling is arranged in the second groove, and the first inner coupling and the second inner coupling are respectively welded with the reducer union;
(2) determining the thickness of a heat insulation layer;
(3) selecting a seamless steel pipe as an outer pressure-bearing pipe;
(4) numbering the inner freezing pipes of the heat insulation sections, winding a heat insulation layer material on the surfaces of the numbered inner freezing pipes of the heat insulation sections by using an adhesive tape, ensuring that the heat insulation layer material is tightly contacted with the inner freezing pipes of the heat insulation sections in the winding process, and sleeving the outer pressure bearing pipes on the outer surfaces of the inner freezing pipes after the heat insulation layer material is wound;
(5) freezing holes are formed in the periphery of the section to be excavated, wherein non-heat-insulation section inner-layer freezing pipes are arranged in the freezing holes in an annular region around the section to be excavated, and heat-insulation section inner-layer freezing pipes are arranged in the freezing holes in the outer ring and the inner ring of the annular region;
(6) and injecting frozen brine into the inner freezing pipe, wherein the soil layer around the inner freezing pipe of the heat insulation section is not frozen, and the soil layer around the inner freezing pipe of the heat insulation section is frozen, so that an annular freezing wall is formed in the annular region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711430824.2A CN108130900B (en) | 2017-12-26 | 2017-12-26 | Vertical energy-saving freezer and method for forming annular freezing wall |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711430824.2A CN108130900B (en) | 2017-12-26 | 2017-12-26 | Vertical energy-saving freezer and method for forming annular freezing wall |
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| CN108130900A CN108130900A (en) | 2018-06-08 |
| CN108130900B true CN108130900B (en) | 2020-08-04 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2743954B2 (en) * | 1992-12-03 | 1998-04-28 | ケミカルグラウト株式会社 | Freezing method and freezing tube |
| CN201077982Y (en) * | 2007-09-11 | 2008-06-25 | 兖矿新陆建设发展有限公司 | Partial freezing device |
| CN103133821B (en) * | 2012-12-11 | 2015-09-02 | 河南煤炭建设集团有限责任公司 | A kind of freezing pipe heat-proof device |
| CN103334757B (en) * | 2013-06-11 | 2015-04-15 | 中国矿业大学(北京) | Freezing pipe, frigo, and method of excavating rock-soil by adopting freezing method |
| CN106894819A (en) * | 2017-04-07 | 2017-06-27 | 淄博王煤矿业有限公司 | Vertical shaft difference freezing plant |
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