CN210369046U - Slip casting pipe network underground structure of prevention urban rail transit percolating water - Google Patents
Slip casting pipe network underground structure of prevention urban rail transit percolating water Download PDFInfo
- Publication number
- CN210369046U CN210369046U CN201921135788.1U CN201921135788U CN210369046U CN 210369046 U CN210369046 U CN 210369046U CN 201921135788 U CN201921135788 U CN 201921135788U CN 210369046 U CN210369046 U CN 210369046U
- Authority
- CN
- China
- Prior art keywords
- grouting
- grouting pipe
- waterproof layer
- pipe network
- side wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000007569 slipcasting Methods 0.000 title claims description 9
- 230000002265 prevention Effects 0.000 title claims description 7
- 239000011440 grout Substances 0.000 claims description 26
- 229920001971 elastomer Polymers 0.000 claims description 8
- 239000000565 sealant Substances 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 28
- 238000010276 construction Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000010422 painting Methods 0.000 description 5
- 229920002635 polyurethane Polymers 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007123 defense Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Landscapes
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The utility model discloses a grouting pipe network underground structure for preventing urban rail transit water leakage, which comprises an underground structure unit section which is arranged between a left enclosing structure and a right enclosing structure and consists of a structure top plate, a structure bottom plate, a structure middle plate and a structure side wall; a roof waterproof layer is arranged at the top of the structural roof, and a side wall waterproof layer is arranged between the structural side wall and the enclosure structure; grouting pipe networks are arranged on the top of the roof waterproof layer and between the side wall waterproof layer and the enclosure structure; and the left side and the right side of the top of the waterproof layer of the top plate are respectively provided with a plurality of slurry inlet pipes which are connected with the grouting pipe network and extend upwards to the ground. The utility model discloses has better antiseep water treatment effect.
Description
Technical Field
The utility model relates to an urban rail transit technical field, in particular to prevention urban rail transit water leakage's slip casting pipe network underground structure.
Background
With the large-scale development of cities, transportation tools for citizens to go out are also continuously improved; and by combining the development and utilization of underground space, urban rail transit becomes a standard for defining whether a city flourishes or not. However, the rail transit engineering as an underground structure is deeply influenced by underground water, and for cities and regions with abundant underground water, the structure is easy to leak water, so that the engineering quality and the trip safety of citizens are influenced.
The waterproof of the urban rail transit underground structure generally follows the principles of 'mainly defense, rigid-flexible combination, multi-channel defense, adaptation to local conditions and comprehensive treatment', and adopts waterproof measures adapted to the principles. The concrete structure is fundamentally self-waterproof, and comprehensive measures such as materials, construction and the like are adopted to control the development of structural concrete cracks, so that the impermeability and the durability of the concrete are improved; the waterproof of detailed structures such as construction joints, deformation joints, wall penetrating pipes, pile heads and the like is taken as a key point; meanwhile, a flexible outer-wrapping waterproof layer is arranged on the upstream side of the structure, namely, the exposed structure adopts single-component polyurethane waterproof paint, 350# paper tire asphalt felt and fine stone protective layer concrete, and other hidden structures adopt asphalt-based polyester tire pre-paved waterproof rolls.
The reason for causing subway structure percolating water is mainly as follows: 1. when the waterproof coiled material is laid, when the base surface is plastered, the base layer is not processed in place, the base surface is uneven, so that the coiled materials of each layer are not well jointed and are not firmly bonded, even, a cavity phenomenon appears at the back of the waterproof layer, and the waterproof layer is broken or squeezed apart due to strong concrete pressure and vibration force during concrete pouring, so that the waterproof layer has no waterproof effect with the same nominal shape. 2. After the waterproof coiled material at the side wall part is laid, the next procedure of side wall reinforcement and side wall template installation is carried out; the phenomenon of damage of a waterproof layer is very likely to occur in the process of binding steel bars or installing templates without protective layer concrete (or related protective measures), and the waterproof layer is not easy to find and modify (the steel bars are encrypted and the sight of the template after installation is greatly influenced). 3. When the structural concrete is poured, the vibration is not compact, the pouring is discontinuous, cold seams are caused, and impurities are mixed; after the pouring is finished, the concrete is not cured in time, and the support is not dismounted according to relevant requirements and specifications to cause the structure to generate cracks; construction joints are left to be set improperly, some construction joints are left to be set randomly even, the construction joints are not processed next time, then water seepage channels are formed by pouring, and concrete weak links are formed by slurry leakage of templates and the like. 4. The rubber waterstop and the like are not positioned seriously in the construction of deformation joints and construction joints, and when concrete on two sides is poured, the rubber waterstop and the like collide randomly to form waterstop distortion and deflection, the lap joint is poor, and the rubber waterstop is fixed by nails to cause serious leakage. 5. When the wall bushing is pre-buried, the bushing is not fixed firmly, deviation occurs when concrete is poured, and concrete at the pipe wall is not compact when later correction is performed. 6. The waterproof coating for the top plate (including an exposed structure) is not constructed properly, the painting times are not enough, and the painting directions of the front painting and the back painting are not correct (the painting directions are vertical to each other); the thickness of the coating is insufficient or uneven (taking a single-component polyurethane waterproof coating as an example, the dosage of the material with the thickness of 1mm per square meter is 1.7 kg-1.8 kg). 7. Quality consciousness of quality management personnel and operation personnel is low, and the behaviors with the hidden dangers are not corrected and corrected in time. 8. The side wall and the enclosure structure have smaller cracks due to the drying shrinkage after the concrete is solidified, and when underground water is abundant and the water pressure is larger, the cracks are filled with water to cause the leakage of the weaker link of the structure.
When water leakage occurs on the side wall of the structure, blind treatment cannot be carried out, and if the treatment process is improper, the side wall of the structure suffers endless diseases and the cost is increased; the leakage of the structure is bound to have a leakage channel, the fundamental problem can be solved only by densely filling the leakage channel, and a common construction method comprises the steps of adopting water-swelling polyurethane, epoxy resin and leakage stoppage king for plugging; however, such a process can only perform plugging inside the structure, which may cause leakage points to occur at one location after plugging, or the material has poor durability and leakage water to occur again after the material fails for a long time, and obviously, the implementation effect of the water leakage prevention technology for performing leakage prevention by using epoxy resin and water-swellable polyurethane in the prior art is not very good.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide a slip casting pipe network underground structure of prevention urban rail transit percolating water, have better antiseep water treatment effect.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is:
a grouting pipe network underground structure for preventing urban rail transit water leakage comprises an underground structure unit section which is arranged between a left enclosing structure and a right enclosing structure and consists of a structure top plate, a structure bottom plate, a structure middle plate and a structure side wall; a roof waterproof layer is arranged at the top of the structural roof, and a side wall waterproof layer is arranged between the structural side wall and the enclosure structure; grouting pipe networks are arranged on the top of the roof waterproof layer and between the side wall waterproof layer and the enclosure structure; and the left side and the right side of the top of the waterproof layer of the top plate are respectively provided with a plurality of slurry inlet pipes which are connected with the grouting pipe network and extend upwards to the ground.
Furthermore, the grouting pipe network in the waterproof layer of the top plate is in a grid shape and comprises three longitudinal grouting pipes which are arranged in parallel and three transverse grouting pipes which are respectively communicated with pipe orifices at two ends and the middle part of the three longitudinal grouting pipes, and the left end and the right end of each transverse grouting pipe and the part of each transverse grouting pipe after being respectively connected with the pipe orifices at two ends of each longitudinal grouting pipe are upwards extending grouting pipes; the grouting pipe network in the side wall waterproof layer comprises three vertical grouting pipes, the top ends of the three vertical grouting pipes are correspondingly communicated with one ends of the three transverse grouting pipes respectively, and the bottom ends of the three vertical grouting pipes are plugged by adopting a sealant.
Furthermore, the grouting pipes are connected by adopting a tee joint or a cross connecting joint.
Furthermore, the grouting pipe adopts a high-pressure flexible rubber pipe.
Furthermore, grout overflow holes formed in the grouting pipe are arranged in a quincunx shape, the distance between every two adjacent grout overflow holes is 500mm, and the size of each hole is 6-8 mm.
Furthermore, an adhesive tape is adhered to the pulp overflow hole during pre-embedding.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the utility model discloses a through the experience summary of a plurality of project structure percolating water processing, pre-buried repeatedly usable's slip casting pipe in roof waterproof layer and side wall waterproof layer treats and carries out the slip casting after the underground structure construction is accomplished, makes the thick liquid closely knit with the structure outside and envelope's crack, the crack packing of structure, and practice shows, the utility model discloses the construction is simple, convenient to use, and the antiseep water effect is comparatively ideal.
Drawings
FIG. 1 is a cross-sectional view of the grouting pipe of the present invention;
FIG. 2 is a plan view of the grouting pipe of the present invention;
in the figure: 1. the construction method comprises the following steps of structural top plate, 2 structural bottom plate, 3 structural middle plate, 4 structural side wall, 5 top plate waterproof layer, 6 side wall waterproof layer, 7 grouting pipe, 8 enclosing structure, 9 backfill earthwork, 10 ground, 11 crown beam, 12 tee joint connector, 13 sealant, 14 grout inlet pipe, 15 structural construction section joint.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model discloses a grouting pipe network underground structure for preventing urban rail transit water leakage, which comprises an underground structure unit section arranged between a left enclosing structure 8 and a right enclosing structure 8 and composed of a structure top plate 1, a structure bottom plate 2, a structure middle plate 3 and a structure side wall 4; backfill earthwork 9 is arranged above the structure top plate 1, a top plate waterproof layer 5 is arranged at the top of the structure top plate 1, and a side wall waterproof layer 6 is arranged between the structure side wall 4 and the enclosure structure 8; grouting pipe networks are arranged on the top of the top plate waterproof layer 5 and between the side wall waterproof layer 6 and the enclosure structure 8; grout overflow holes are formed in the grouting pipes 7 forming the grouting pipe network, and a plurality of grout inlet pipes 14 which are connected with the grouting pipe network and extend upwards to the ground 10 are respectively arranged on the left side and the right side of the top plate waterproof layer 5.
As shown in fig. 2, a structural construction segmental joint 15 is provided between adjacent underground structural unit segments. The grouting pipe network in the top plate waterproof layer 5 is in a grid shape, and comprises three longitudinal grouting pipes which are arranged in parallel and three transverse grouting pipes which are respectively communicated with pipe orifices at two ends and the middle parts of the three longitudinal grouting pipes, the left end and the right end of each transverse grouting pipe are respectively connected with the pipe orifices at two ends of the longitudinal grouting pipe, then the parts of the left end and the right end of each transverse grouting pipe are respectively provided with a slurry inlet pipe 14 which extends upwards, and the slurry inlet pipes 14 upwards penetrate through the backfilling direction 9 and extend to the crown beam of the ground 10; the grouting pipe network in the side wall waterproof layer 6 comprises three vertical grouting pipes, the top ends of the three vertical grouting pipes are correspondingly communicated with one ends of the three transverse grouting pipes respectively, and the bottom ends of the three vertical grouting pipes are plugged by adopting a sealant 13. The transverse grouting pipes are perpendicular to the longitudinal grouting pipes, and the grouting pipes are connected by adopting a cross or three-way connector 12.
And the transverse grouting pipe, the longitudinal grouting pipe and the vertical grouting pipe can be properly encrypted at the deformation joint of the construction joint, the tunnel portal position and the water seepage position of the enclosure structure.
The utility model discloses slip casting pipe's selection: according to experience, the pipelines which are provided with grouting and are suitable for the field are roughly three types, namely PVC plastic pipes, repeatable grouting pipes and high-pressure flexible rubber pipes. The PVC plastic pipe has better strength, is convenient to punch a grout overflow hole, but has brittleness, and is easy to break or damage in the construction pre-embedding process; the grouting pipe can be repeated and is provided with a grout overflow hole, but the grouting pipe is easy to burst and damage when the grouting pressure reaches about 0.5 MPa; the high-pressure flexible rubber pipe has good flexibility, is easy to punch a grout overflow hole and can bear larger grouting pressure. Therefore, the utility model discloses a slip casting pipe adopts the flexible rubber tube of high pressure.
And before the grouting pipe is buried, an electric drill is adopted to punch a grout overflow hole on the grouting pipe. The grout overflow holes are arranged in a quincunx shape, the distance between every two adjacent grout overflow holes is 500mm, the size of each hole is 6 mm-8 mm, and after the grout overflow holes are punched, adhesive tapes are pasted on the grout overflow holes for sealing when the grout overflow holes are pre-buried, so that the grout is prevented from blocking the grout overflow holes in the concrete pouring process.
Roof infiltration test: after the underground structure unit section is finished and before the roof waterproof layer is constructed, constructing crown beams 11 for blocking water with the height of about 1-1.2 m at two ends, and enabling the structure roof 1, the enclosing structures 8 at two sides and the crown beams 11 to form a simple reservoir; then, filling water into the water storage tank, wherein the water depth is about 0.8-1 m; arranging personnel to observe the water leakage condition at the structural top plate 1 at the station hall layer, and making detailed record and mark.
Grouting treatment: a. after the project is finished, uniformly checking the water seepage and leakage conditions of the structure (water can be injected into the grouting pipe and then the water seepage condition of the structure can be observed); when the condition of water leakage is found, related data and original records are consulted firstly, a stand for quality defect of the water leakage is established, the position and mileage of a leakage point and the size of water leakage are recorded and analyzed in detail, and a grouting scheme (mainly the water-to-glue ratio of slurry and the determination of single or double liquids) is determined. b. After the water leakage situation is accurately mastered, grout with a corresponding water-to-glue ratio is prepared, grouting treatment is carried out on a grouting pipe pre-embedded at the water leakage position, namely, grout with certain pressure is injected into a grouting pipe network from a grout inlet pipe at or near the position, and grouting is simultaneously carried out while recording until the consistency of the grout flowing out from the water leakage position is matched with the consistency of the prepared grout and the pressure gauge is obviously increased, so that grouting can be stopped. c. And (3) injecting clear water for 1-2 min into the pre-embedded grouting pipe from the grouting pipe, and cleaning the grout in the grouting pipe to ensure that the grouting pipe can be reused so as to prevent the water leakage condition from occurring after the structure.
Claims (6)
1. The utility model provides a slip casting pipe network underground structure of prevention urban rail transit percolating water which characterized in that: the underground structure comprises an underground structure unit section which is arranged between a left enclosing structure (8) and a right enclosing structure (8) and consists of a structure top plate (1), a structure bottom plate (2), a structure middle plate (3) and a structure side wall (4); a roof waterproof layer (5) is arranged at the top of the structural roof (1), and a side wall waterproof layer (6) is arranged between the structural side wall (4) and the enclosing structure (8); grouting pipe networks are arranged at the top of the top plate waterproof layer (5) and between the side wall waterproof layer (6) and the enclosure structure (8); the grouting pipe (7) forming the grouting pipe network is provided with a grout overflow hole, and the left side and the right side of the top plate waterproof layer (5) are respectively provided with a plurality of grout inlet pipes (14) which are connected with the grouting pipe network and extend upwards to the ground (10).
2. The underground structure of the grouting pipe network for preventing water leakage of urban rail transit according to claim 1, wherein: the grouting pipe network in the top plate waterproof layer (5) is in a grid shape and comprises three longitudinal grouting pipes which are arranged in parallel and three transverse grouting pipes which are respectively communicated with pipe orifices at two ends and the middle parts of the three longitudinal grouting pipes, and the left end and the right end of each transverse grouting pipe and the part of each transverse grouting pipe after being respectively connected with the pipe orifices at two ends of each longitudinal grouting pipe are upwards extending grouting pipes (14); the grouting pipe network in the side wall waterproof layer (6) comprises three vertical grouting pipes, the top ends of the three vertical grouting pipes are correspondingly communicated with one ends of the three horizontal grouting pipes respectively, and the bottom ends of the three vertical grouting pipes are plugged by adopting a sealant (13).
3. The underground structure of the grouting pipe network for preventing water leakage of urban rail transit according to claim 2, wherein: the grouting pipes are connected by adopting a tee joint or a cross connecting joint.
4. The underground structure of a grouting pipe network for preventing water leakage of urban rail transit according to claim 1 or 2, wherein: the grouting pipe is a high-pressure flexible rubber pipe.
5. The underground structure of a grouting pipe network for preventing water leakage of urban rail transit according to claim 1 or 2, wherein: the grout overflow holes formed in the grouting pipe are arranged in a quincunx shape, the distance between every two adjacent grout overflow holes is 500mm, and the size of each hole is 6-8 mm.
6. The underground structure of a grouting pipe network for preventing water leakage of urban rail transit according to claim 1 or 2, wherein: the adhesive tape is adhered to the pulp overflow hole when the pulp is pre-buried.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921135788.1U CN210369046U (en) | 2019-07-19 | 2019-07-19 | Slip casting pipe network underground structure of prevention urban rail transit percolating water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921135788.1U CN210369046U (en) | 2019-07-19 | 2019-07-19 | Slip casting pipe network underground structure of prevention urban rail transit percolating water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210369046U true CN210369046U (en) | 2020-04-21 |
Family
ID=70272549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921135788.1U Expired - Fee Related CN210369046U (en) | 2019-07-19 | 2019-07-19 | Slip casting pipe network underground structure of prevention urban rail transit percolating water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210369046U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114351763A (en) * | 2022-02-18 | 2022-04-15 | 中建七局交通建设有限公司 | Grouting and leaking stoppage construction method between subway station side wall and enclosure structure |
-
2019
- 2019-07-19 CN CN201921135788.1U patent/CN210369046U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114351763A (en) * | 2022-02-18 | 2022-04-15 | 中建七局交通建设有限公司 | Grouting and leaking stoppage construction method between subway station side wall and enclosure structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109457735B (en) | Method for repairing concrete wall and bottom plate water seepage cracks | |
| CN106088364B (en) | A kind of basement antiseep connection structure and its construction method | |
| CN107387123B (en) | The construction method of pressure grouting leak stopping is carried out for shield duct piece piece leakage phenomenon | |
| CN103343538B (en) | Supporting and construction method of steel sheet pile under soft foundation of high flow plastic deep layer | |
| CN107268636A (en) | The diaphragm wall foundation ditch that the steel cylinder or steel sheet pile of a kind of seal groove and occlusion structure are constituted is with going along with sb. to guard him and construction method | |
| CN103225318B (en) | Anti-seepage and leaking-stoppage device for underground consecutive wall groove section joint point and construction method thereof | |
| CN111677520B (en) | Construction method for excavating station structure by tunnel-first station-later station pipe curtain hole-pile method | |
| CN206143827U (en) | Underground works crack repairing structure | |
| CN108397200A (en) | Back-fabricated construction method for tunnel connection section structure of subway station | |
| CN110778333A (en) | Tunnel leakage repairing method | |
| CN210369046U (en) | Slip casting pipe network underground structure of prevention urban rail transit percolating water | |
| CN112281927A (en) | Construction method for treating leakage of independent foundation of frame column | |
| CN109056801A (en) | Waterproof construction process for bottom plate of comprehensive pipe rack | |
| CN109667607B (en) | Tunnel partition waterproof construction process | |
| CN111676954A (en) | Locking type high polymer anti-seepage wall forming groove plate and construction method | |
| CN201424658Y (en) | Water leakage detection of underground continuous wall groove seams and block repair device | |
| CN111441761A (en) | Simulation device and simulation method for preventing slurry loss during formation drilling | |
| CN112360518B (en) | Rapid maintenance structure and maintenance method for tunnel circumferential construction joint | |
| CN110230272A (en) | A kind of pipe culvert construction method | |
| CN211006779U (en) | Water stop ring device of lattice column pile | |
| CN111441311A (en) | Underwater repair method for leakage of old dam structure seam | |
| CN112901222B (en) | Treatment process for concrete water seepage cracks of inverted arch of tunnel | |
| CN206512759U (en) | A kind of ground-connecting-wall G type joints of pre-buried repeatable Grouting Pipe | |
| CN215170060U (en) | Hide roof trompil formula tunnel | |
| CN211228618U (en) | Fixing device for underground structure rectangular section water stop belt |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200529 Address after: 421000 dragon Chu Hui District of Hunan city of Hengyang Province Ping No. 44 Patentee after: THE 2ND ENGINEERING CO.,LTD. OF CHINA RAILWAY 5TH BUREAU Group Address before: No. 45, longjiaping, Zhuhui District, Hengyang City, Hunan Province Patentee before: Yang Huanbai |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200421 |