CN107794912B - Reinforced concrete precast pile suitable for permafrost region and manufacturing method thereof - Google Patents
Reinforced concrete precast pile suitable for permafrost region and manufacturing method thereof Download PDFInfo
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- CN107794912B CN107794912B CN201710882382.9A CN201710882382A CN107794912B CN 107794912 B CN107794912 B CN 107794912B CN 201710882382 A CN201710882382 A CN 201710882382A CN 107794912 B CN107794912 B CN 107794912B
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- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000005057 refrigeration Methods 0.000 claims abstract description 33
- 238000009833 condensation Methods 0.000 claims abstract description 22
- 230000005494 condensation Effects 0.000 claims abstract description 22
- 230000008020 evaporation Effects 0.000 claims abstract description 11
- 238000001704 evaporation Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000004567 concrete Substances 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 15
- 230000002787 reinforcement Effects 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 238000012790 confirmation Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000002689 soil Substances 0.000 abstract description 12
- 230000036571 hydration Effects 0.000 abstract description 2
- 238000006703 hydration reaction Methods 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
- F25B21/02—Machines, plants or systems, using electric or magnetic effects using Peltier effect; using Nernst-Ettinghausen effect
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2321/00—Details of machines, plants or systems, using electric or magnetic effects
- F25B2321/02—Details of machines, plants or systems, using electric or magnetic effects using Peltier effects; using Nernst-Ettinghausen effects
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Sustainable Development (AREA)
- Piles And Underground Anchors (AREA)
- Foundations (AREA)
Abstract
The invention provides a reinforced concrete precast pile suitable for permafrost regions and a manufacturing method thereof. The precast pile comprises a precast reinforced concrete hollow pile and a refrigeration heat pipe, wherein the precast reinforced concrete hollow pile is implanted into a permafrost foundation. The prefabricated reinforced concrete hollow pile comprises a pile body and a pile tip. The pile body comprises an upper pile and a lower pile. And the outer wall of the lower pile is provided with a plurality of heat conduction small holes. And after the lower pile passes through the upper limit of the permafrost, the lower pile is embedded into the permafrost layer below the lower pile. The evaporation section of the refrigeration heat pipe is inserted into the inner cavity of the pile body, and the condensation section extends out of the pile body. The manufacturing method of the precast pile comprises the steps of manufacturing the refrigeration heat pipe and the precast reinforced concrete hollow pile, sinking the pile, installing the refrigeration heat pipe, processing the pile head and the like. The precast pile avoids the influence of hydration heat generated in the process of concrete solidification of the pile body on the permafrost foundation around the pile, so that the temperature of the soil body around the pile is reduced, and the frozen state is kept.
Description
Technical Field
The invention relates to the technical field of foundation and foundation engineering, in particular to a reinforced concrete precast pile.
Background
Permafrost refers to a layer of earth rock that freezes for many years. Can be divided into an upper layer and a lower layer: the upper layer melts in summer and freezes in winter every year, and is called as a moving layer or an ice melting layer; the lower layer is in a frozen state all year round and is called as a permafrost layer or a perennial frost layer. The distribution area of the permafrost in China is wider, about 215 kilo square kilometers, and the permafrost is divided into high-latitude permafrost and high-altitude permafrost according to the difference of geographical positions. The frozen soil at high latitude for many years is mainly and intensively distributed in big and small Xinggan mountains, and the area is 38-39 ten thousand square kilometers. The high-altitude permafrost is distributed on Qinghai-Tibet plateau, Altai mountain, Tianshan mountain, Qilian mountain, transection mountain, Himalayashan mountain and some east mountainous regions, such as Changbai mountain, Huanggang Liang mountain, Wutai mountain, Taibai mountain, etc.
Along with the economic and social development of China, the engineering construction scale of permafrost regions is continuously increased, and the foundation burial depth is also continuously increased. In non-frozen soil areas and seasonal frozen soil areas, pile foundations are one of mature foundation types and are widely applied to various building projects. However, in permafrost regions, the application of the pile foundation needs to solve the following problems: (1) the frozen soil around the pile is easy to melt during the construction of the pile foundation, so that the bearing capacity of the foundation soil is obviously reduced and even lost; (2) after the construction of the pile foundation is finished, the soil mass around the pile is long in refreezing time, so that the bearing capacity of the pile foundation can gradually reach a design value after a long time, and the construction time of an upper structure has to be reduced; (3) after the construction is completed, the upper limit of the frozen soil around the pile is lowered due to the heat conductivity of the pile foundation, and the bearing capacity of the pile foundation is further reduced.
For the 3 problems mentioned above, the existing solutions only minimize the severity of the problem consequences and do not form a good solution.
Disclosure of Invention
The invention aims to provide a reinforced concrete precast pile suitable for permafrost regions and a manufacturing method thereof, and aims to solve the problems in the prior art.
The technical scheme adopted for achieving the aim of the invention is that the reinforced concrete precast pile suitable for permafrost regions is characterized by comprising the following components: the prefabricated reinforced concrete hollow pile and the refrigeration heat pipe are implanted into the permafrost foundation.
The prefabricated reinforced concrete hollow pile comprises a pile body and a pile tip. The pile body comprises an upper pile and a lower pile. The lower pile is arranged at the bottom of the upper pile. The upper pile and the lower pile are integrated.
And the outer wall of the lower pile is provided with a plurality of heat conduction small holes. The heat conducting small holes are distributed along the radial direction of the lower pile and are communicated with the outer side of the periphery of the pile and the inner cavity of the pile body of the prefabricated reinforced concrete hollow pile. And after the lower pile passes through the upper limit of the permafrost, the lower pile is embedded into the permafrost layer below the lower pile.
The refrigeration heat pipe sequentially comprises an evaporation section, a condensation section I and a condensation section II from bottom to top. The evaporation section of the refrigeration heat pipe is inserted into the inner cavity of the pile body, and the condensation section extends out of the pile body. And the outer surface of the pipe shell of the condensation section I is connected with a plurality of radiating fins. And the outer surface of the tube shell of the condensation section II is connected with a solar semiconductor refrigerating device. The outer wall of the solar semiconductor refrigerating device is sleeved with a plurality of radiating fins.
And a heat conduction layer and a sealing layer are arranged in the inner cavity of the pile body from bottom to top. And the heat conducting layer adopts heat conducting materials to fill a gap between the evaporation section and the inner cavity of the lower pile body. And the sealing layer is compacted and filled to the pile top by adopting concrete or mortar. The heat conduction layer, the sealing layer and the pile body are cemented and solidified into a whole.
Further, the cross section of the pile body is in a circular ring shape.
Furthermore, the pile body is internally provided with a pile body main rib and a pile body spiral stirrup. The pile body main reinforcement and the pile body spiral stirrup jointly form a reinforcement cage.
The invention also discloses a manufacturing method of the reinforced concrete precast pile, which comprises the following steps:
1) the factory prefabricated refrigeration heat pipe and the prefabricated reinforced concrete hollow pile.
2) And sinking the prefabricated reinforced concrete hollow pile into the permafrost foundation by adopting a driving method or a pressing-in method according to the designed position and the penetration depth of the foundation pile.
3) And installing the refrigeration heat pipe, filling working liquid into the refrigeration heat pipe after confirming that no error exists, and sealing after vacuumizing.
4) And cutting off redundant pile bodies according to the designed pile top elevation. And treating the pile head according to the connection requirement of the pile top and the upper structure.
5) Filling the heat conducting layer and the sealing layer.
Further, in the step 2), when the length of the single pile body is smaller than the length of the designed foundation pile, lengthening according to actual requirements.
The technical effects of the invention are undoubted:
A. the influence of hydration heat generated in the process of solidifying the pile body concrete on the permafrost foundation around the pile is avoided;
B. when the refrigeration heat pipe works, the refrigeration quantity can be continuously led into the lower pile body and quickly led into the soil body around the pile through the heat conduction small holes, so that the temperature of the soil body around the pile is reduced, the frozen state is kept, and the upper limit of the permafrost is not reduced;
C. the condensing section I utilizes low temperature heat dissipation to promote the work of the refrigeration heat pipe in cold seasons, and the condensing section II utilizes solar energy refrigeration to promote the work of the refrigeration heat pipe in warm seasons, so that the refrigeration heat pipe can be ensured to be in a working state all the year round.
Drawings
FIG. 1 is a schematic diagram of a precast pile;
FIG. 2 is a cross-sectional view of a lower pile;
FIG. 3 is a schematic view of a refrigeration heat pipe;
FIG. 4 is a cross-sectional view of the condensation section I;
FIG. 5 is a cross-sectional view of the condensation section II;
fig. 6 is a schematic structural diagram of a precast pile.
In the figure: the prefabricated reinforced concrete hollow pile comprises a prefabricated reinforced concrete hollow pile 1, a pile body 101, an upper pile 1011, a lower pile 1012, a heat conduction small hole 10121, a pile body inner cavity 1013, a reinforcement cage 1014, a pile body main reinforcement 10141, a pile body spiral stirrup 10142, a pile tip 102, a refrigeration heat pipe 2, an evaporation section 201, a condensation section I202, a condensation section II 203, a heat conduction layer 3, a sealing layer 4, a cooling fin 5 and a solar semiconductor refrigeration device 6.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.
Example 1:
the embodiment discloses a reinforced concrete precast pile who is suitable for permafrost region includes: the prefabricated reinforced concrete hollow pile 1 and the refrigeration heat pipe 2 are implanted into the permafrost foundation.
Referring to fig. 1, 2 and 6, the prefabricated reinforced concrete hollow pile 1 comprises a pile body 101 and a pile tip 102. The shaft 101 includes an upper pile 1011 and a lower pile 1012. The lower pile 1012 is disposed at the bottom of the upper pile 1011. The upper pile 1011 and the lower pile 1012 are integral. The pile body 101 is provided with a pile body main reinforcement 10141 and a pile body spiral stirrup 10142. The pile body main reinforcement 10141 and the pile body spiral stirrup 10142 jointly form a reinforcement cage 1014.
The lower pile 1012 has a plurality of small heat conducting holes 10121 on its outer wall. The heat conducting small holes 10121 are distributed along the radial direction of the lower pile 1012 and are communicated with the outer side of the periphery of the pile and the inner cavity 1013 of the pile body of the precast reinforced concrete hollow pile 1. The lower piles 1012 penetrate the upper limit of the permafrost and are embedded into the permafrost layer below.
Referring to fig. 3, 4 and 5, the heat pipe 2 includes, from bottom to top, an evaporation section 201, a condensation section i 202 and a condensation section ii 203. The evaporation section 201 of the refrigeration heat pipe 2 is inserted into the pile body inner cavity 1013, and the condensation section extends out of the pile body. A plurality of radiating fins 5 are sleeved on the outer surface of the pipe shell of the condensation section I202. And the outer surface of the shell of the condensation section II 203 is connected with a solar semiconductor refrigerating device 6. The outer wall of the solar semiconductor refrigerating device 6 is sleeved with a plurality of radiating fins 5.
Referring to fig. 6, the shaft cavity 1013 is provided with a heat conducting layer 3 and a sealing layer 4 from bottom to top. The heat conduction layer 3 adopts heat conduction material to fill the gap between the evaporation section 201 and the inner cavity of the pile body of the lower pile 1012. And the sealing layer 4 is compacted and filled to the pile top by adopting concrete or mortar. The heat conduction layer 3 and the sealing layer 4 are cemented and solidified with the pile body 101 into a whole.
The arrangement of the cooling fins 5 and the solar semiconductor refrigerating device 6 can ensure that the refrigerating heat pipe 2 is in a working state all the year round. The cooling fins 5 can dissipate heat by using low temperature in cold seasons to promote the work of the refrigeration heat pipe 2. The solar semiconductor refrigerating device 6 can utilize solar energy to refrigerate in warm seasons to promote the refrigerating heat pipe 2 to work. When the refrigeration heat pipe 2 works, the cold energy can be continuously led into the pile body 101, and the quick transmission of the heat inside and outside the pile body 101 is realized through the heat conduction small hole 10121. The cold energy is quickly led into the soil body around the pile, so that the temperature of the soil body around the pile is reduced, the frozen state is kept, and the upper limit of the permafrost is not reduced.
It should be noted that, in the present embodiment, the cross-sectional shape of the pile body 101 is a circular ring. In actual engineering, the cross section can be selected to be in a shape of Chinese character 'hui', and the like according to geological conditions and the size requirement of a pile body.
Example 2:
the embodiment discloses a method for manufacturing a reinforced concrete precast pile in relation to embodiment 1, which comprises the following steps:
1) and manufacturing the prefabricated reinforced concrete hollow pile 1 in a factory according to the designed pile body size, the steel bar arrangement and the concrete strength requirement. According to the design structure and size requirements, a pipe shell, a pipe core and a working medium of the refrigeration heat pipe 2 are manufactured in a factory, and the solar semiconductor refrigeration device 6 is manufactured in the factory according to the size and power requirements of the condensation section II 203.
2) And (5) pile sinking construction. And sinking the prefabricated reinforced concrete hollow pile 1 into the permafrost foundation by adopting a driving method or a pressing-in method according to the designed foundation pile position and the designed penetration depth. When the length of the single-section pile body 101 is smaller than the length of the designed foundation pile, the pile body 101 can be lengthened according to actual needs.
3) And installing the refrigeration heat pipe 2, filling working liquid into the refrigeration heat pipe 2 after the confirmation is correct, and sealing after vacuumizing.
4) And cutting off the redundant pile body 101 according to the designed pile top elevation. And treating the pile head according to the connection requirement of the pile top and the upper structure.
5) Filling the heat conducting layer 3 and the closing layer 4.
Claims (5)
1. A reinforced concrete precast pile suitable for permafrost regions is characterized by comprising: a prefabricated reinforced concrete hollow pile (1) and a refrigeration heat pipe (2) which are implanted into a permafrost foundation;
the prefabricated reinforced concrete hollow pile (1) comprises a pile body (101) and a pile tip (102); the pile body (101) comprises an upper pile (1011) and a lower pile (1012); the lower pile (1012) is arranged at the bottom of the upper pile (1011); the upper pile (1011) and the lower pile (1012) are integrated;
the outer wall of the lower pile (1012) is provided with a plurality of heat conduction small holes (10121); the heat conducting small holes (10121) are distributed along the radial direction of the lower pile (1012) and are communicated with the outer side of the periphery of the pile and the pile body inner cavity (1013) of the precast reinforced concrete hollow pile (1); the lower pile (1012) penetrates through the upper limit of the permafrost and is embedded into the permafrost layer below the lower pile;
the refrigeration heat pipe (2) sequentially comprises an evaporation section (201), a condensation section I (202) and a condensation section II (203) from bottom to top; the evaporation section (201) of the refrigeration heat pipe (2) is inserted into the pile body inner cavity (1013), and the condensation section I (202) and the condensation section II (203) extend out of the pile body; the outer surface of the pipe shell of the condensation section I (202) is connected with a plurality of radiating fins (5); the outer surface of the pipe shell of the condensation section II (203) is connected with a solar semiconductor refrigerating device (6); the outer wall of the solar semiconductor refrigerating device (6) is sleeved with a plurality of radiating fins (5);
a heat conducting layer (3) and a sealing layer (4) are arranged in the pile body inner cavity (1013) from bottom to top; the heat conduction layer (3) adopts heat conduction materials to fill the gap between the evaporation section (201) and the inner cavity of the lower pile (1012); the sealing layer (4) is compacted and filled to the pile top by adopting concrete or mortar; the heat conduction layer (3), the sealing layer (4) and the pile body (101) are cemented and solidified into a whole.
2. A precast reinforced concrete pile suitable for permafrost regions according to claim 1, wherein: the cross section of the pile body (101) is in the shape of a circular ring.
3. A precast reinforced concrete pile suitable for permafrost regions according to claim 1, wherein: the pile body (101) is internally provided with a pile body main reinforcement (10141) and a pile body spiral stirrup (10142); the pile body main reinforcement (10141) and the pile body spiral stirrup (10142) jointly form a reinforcement cage (1014).
4. The construction method of the reinforced concrete precast pile according to claim 1, comprising the steps of:
1) the method comprises the following steps of prefabricating a refrigeration heat pipe (2) and a prefabricated reinforced concrete hollow pile (1) in a factory;
2) sinking the prefabricated reinforced concrete hollow pile (1) into the permafrost foundation by adopting a driving-in method or a pressing-in method according to the designed foundation pile position and the designed penetration depth;
3) installing the refrigeration heat pipe (2), filling working liquid into the refrigeration heat pipe (2) after the confirmation of no error, and sealing after vacuumizing;
4) cutting off redundant pile bodies (101) according to the designed pile top elevation; processing the pile head according to the connection requirement of the pile top and the upper structure;
5) filling the heat conduction layer (3) and the sealing layer (4).
5. The method for manufacturing a precast reinforced concrete pile according to claim 4, wherein: in the step 2), when the length of the single pile body (101) is smaller than the length of the designed foundation pile, lengthening according to actual requirements.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710882382.9A CN107794912B (en) | 2017-09-26 | 2017-09-26 | Reinforced concrete precast pile suitable for permafrost region and manufacturing method thereof |
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| CN201710882382.9A CN107794912B (en) | 2017-09-26 | 2017-09-26 | Reinforced concrete precast pile suitable for permafrost region and manufacturing method thereof |
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| CN107794912A CN107794912A (en) | 2018-03-13 |
| CN107794912B true CN107794912B (en) | 2021-01-12 |
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| CN110424377A (en) * | 2019-08-21 | 2019-11-08 | 东北大学 | A kind of anti-freeze-thaw damage stake of intelligent temperature control |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002371552A (en) * | 2001-06-18 | 2002-12-26 | Nippon Steel Corp | Rotary press-in steel pipe pile, rotary press-in reinforced concrete pile, and method of manufacturing rotary press-in steel pipe pile and rotary pres-in reinforced concrete pile |
| CN2589513Y (en) * | 2002-12-26 | 2003-12-03 | 刘纪福 | Heat pipe foundation pile applied to permafrost zone |
| CN103590293A (en) * | 2013-11-18 | 2014-02-19 | 中铁西北科学研究院有限公司 | Method for maintaining thermal stability of permafrost foundation subgrade by using solar refrigeration device |
| CN104358265A (en) * | 2014-11-06 | 2015-02-18 | 兰州理工大学 | Active refrigeration and self-recovery cold region side slope support structure and construction method |
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2017
- 2017-09-26 CN CN201710882382.9A patent/CN107794912B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002371552A (en) * | 2001-06-18 | 2002-12-26 | Nippon Steel Corp | Rotary press-in steel pipe pile, rotary press-in reinforced concrete pile, and method of manufacturing rotary press-in steel pipe pile and rotary pres-in reinforced concrete pile |
| CN2589513Y (en) * | 2002-12-26 | 2003-12-03 | 刘纪福 | Heat pipe foundation pile applied to permafrost zone |
| CN103590293A (en) * | 2013-11-18 | 2014-02-19 | 中铁西北科学研究院有限公司 | Method for maintaining thermal stability of permafrost foundation subgrade by using solar refrigeration device |
| CN104358265A (en) * | 2014-11-06 | 2015-02-18 | 兰州理工大学 | Active refrigeration and self-recovery cold region side slope support structure and construction method |
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Effective date of registration: 20240119 Address after: 563000 Zhangjiao Industrial Park, Fenggang County Development Zone, Zunyi City, Guizhou Province Patentee after: Guizhou Fenggang Hualian Commercial Concrete Co.,Ltd. Address before: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee before: Dragon totem Technology (Hefei) Co.,Ltd. Effective date of registration: 20240119 Address after: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee after: Dragon totem Technology (Hefei) Co.,Ltd. Address before: 400074 No. 66, Xuefu Avenue, Nan'an District, Chongqing Patentee before: CHONGQING JIAOTONG University |