CN108547662A - A kind of tunnel drainage system and method - Google Patents
A kind of tunnel drainage system and method Download PDFInfo
- Publication number
- CN108547662A CN108547662A CN201810333403.6A CN201810333403A CN108547662A CN 108547662 A CN108547662 A CN 108547662A CN 201810333403 A CN201810333403 A CN 201810333403A CN 108547662 A CN108547662 A CN 108547662A
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- China
- Prior art keywords
- gas
- pipe
- valve
- water
- gas cylinder
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 238000005553 drilling Methods 0.000 claims abstract description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 24
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000012780 transparent material Substances 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 4
- 239000011435 rock Substances 0.000 abstract description 4
- 230000006378 damage Effects 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 230000003628 erosive effect Effects 0.000 abstract description 2
- 230000001687 destabilization Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical class C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 235000005979 Citrus limon Nutrition 0.000 description 2
- 235000015165 citric acid Nutrition 0.000 description 2
- 244000248349 Citrus limon Species 0.000 description 1
- 244000131522 Citrus pyriformis Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012279 drainage procedure Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The water leakage defect in tunnel is exactly the problem of the operation of puzzlement tunnel and maintenance, the long-term percolating water in tunnel can generate erosion damage to tunnel-liner, percolating water also will produce emollescence to tunnel surrounding, reduce the intensity of country rock, wall rock destabilization is caused to destroy, the present invention provides a kind of tunnel drainage system, the system includes drilling, gutter, gas compressed water generation apparatus etc., being filled with water tank by high pressure gas inversely presses water to start siphon, solve the problems, such as the accumulation of siphon pipe air and silt silting, not by other electrical equipments, it is simple and reliable, material simply easily obtains, it is not interfered by other external conditions, it is applied widely, field massif tunnel suitable for remote districts.
Description
Technical field
The invention belongs to Tunnel Engineering fields, and in particular to a kind of tunnel drainage system and method, especially suitable for massif
The draining of tunnel surrounding.
Background technology
The water leakage defect in tunnel is exactly the problem of the operation of puzzlement tunnel and maintenance.The long-term percolating water in tunnel can be to tunnel
Road lining cutting generates erosion damage, and percolating water also will produce emollescence to tunnel surrounding, reduce the intensity of country rock, cause country rock
Unstable failure.Tunnel Water Leakage, which drops onto road surface, can cause surface gathered water or icing, influence traffic circulation.Current drainage measure
Larger to the destruction of lining cutting globality, draining range is smaller, and long-term is ineffective, and the cost for maintenance is higher.
Siphon technology has universal application in hydraulic engineering field, such as slope drainage, tunnel drainage, mudstone flowing water stone point
From, soft soil foundation draining etc., tunnel siphon drainage technology, with osculum arrangement is convenient, water-collecting capacity is strong, cuts drainage effect
Well, the advantages that engineering construction speed is fast, however in the engineering using tunnel siphon drainage method, it needs to keep at the top of siphon pipe
Certain vacuum degree, but can be precipitated under the bubble negative pressure being dissolved in water, due to outside air penetrates into siphon pipe etc., portion
Siphon pipe is divided usually to cause vacuum degree to decline because air is accumulated in pipe, part siphon pipe can temporarily be in the shape that is stopped
State, if siphon pipe is in for a long time arrheas state, in siphon drainage being caused difficult in maintenance or even entire siphon drainge system
Disconnected, siphon startup becomes abnormal difficult.In addition, tunnel siphon drainage technology generally uses diameter 4mm siphon pipes below, siphon
Pipe caliber is smaller, is susceptible to silt silting situation, can equally siphon be caused to interrupt, is difficult to restart after interruption.
Invention content
The present invention provides a kind of tunnel drainage system for existing tunnel siphon drainge system technological deficiency difficult in maintenance
And method, siphon startup can be repeated during tunnel siphon drainge system use, solve in drainage procedure because of siphon pipe
The problem of interior air accumulates and needs maintenance and restart siphon, also solves the problems, such as silt silting in siphon pipe.
The technical scheme is that：A kind of tunnel drainage system, the system include drilling, siphon pipe, gutter, gas pressure
Water installations need the position drained setting drilling, the water inlet of siphon pipe to be placed in drilling in tunnel surrounding, and siphon pipe goes out
The mouth of a river is placed in closed water tank, and the elevation of tank top is less than the elevation of foot of hole, and water tank is made of clear material, gas
Compressed water generation apparatus is located on the roadbed side slope outside tunnel, and gas compressed water generation apparatus includes water tank, exhaust pipe, valve A, drainpipe, valve
B, gas cylinder A, gas cylinder B, diversion pipe, branch pipe, pressure gauge, gas-guide tube, valve C, water tank are arranged on roadbed slope, exhaust pipe installation
At the top of water tank, valve A is mounted on exhaust pipe, and the arrival end of drainpipe is connected to the bottom of water tank, and valve B is mounted on row
The exit of water pipe, gas cylinder A fill sodium carbonate liquor, and gas cylinder B fills acetum, passes through diversion pipe between gas cylinder A and gas cylinder B
Connection, the both ends of diversion pipe are all located at liquid level hereinafter, being equipped with pressure gauge among diversion pipe, and the arrival end of gas-guide tube is placed in gas cylinder A
Within, more than liquid level, the outlet end of gas-guide tube is connect the arrival end of gas-guide tube with water tank, and valve C is mounted on gas-guide tube, branch
Pipe is connected on diversion pipe, and the air inlet of branch pipe is located at the liquid level of gas cylinder A or more.
Further, a diameter of 4mm of the siphon pipe.
Further, the quantity that siphon pipe is placed in the water tank is 50-100 roots.
Further, a diameter of 10mm of the exhaust pipe, a diameter of 10mm of the gas-guide tube.
A kind of tunnel drainage method, this method include：
（1）When tunnel drainage system normal use, valve A is opened, closes valve C；
（2）When half and more siphon pipe stops flowing, valve B is closed, so that cistern water level is increased, gas is by arranging in water tank
Tracheae is discharged；
（3）When water tank collection full water, valve A is closed, squeezes gas cylinder B, acetum is made to flow into gas cylinder A, acetic acid by diversion pipe
It is reacted with sodium carbonate and generates carbon dioxide gas, gas enters gas cylinder B by branch pipe, the air pressure in gas cylinder A and gas cylinder B is made to reach
Balance；
（4）When pressure gauge is shown as 250kpa, valve C is opened, gas is filled with water tank, makes the water in water tank is inverse to be pressed into siphon
Pipe, by siphon pipe silt and air be discharged；
（5）When cistern water level drops to the position of siphon pipe water outlet, valve C is closed, opens valve B, opens valve A, to
Sodium carbonate is supplemented in gas cylinder A, acetic acid is supplemented into gas cylinder B.
Beneficial effects of the present invention are mainly manifested in：
1, the present invention, which by high pressure gas is filled with water tank and inversely presses water, starts siphon, solves the accumulation of siphon pipe air and silt becomes silted up
Stifled problem, it is simple and reliable not by other electrical equipments.
2, material of the present invention simply easily obtains, and is not interfered by other external conditions, applied widely, is suitable for remote districts
Field massif tunnel.
3, the present invention generates gas using chemical reaction, can be used for multiple times, operating method is simple, can also start simultaneously
More siphon pipes, rapidly and efficiently start siphon.
4, the design of gas generating system of the invention ensure that gas continuously flows into water tank, gas cylinder A and gas cylinder B
Interior air pressure remains dynamic equilibrium, keeps whole device reliable and stable.
Description of the drawings
Fig. 1 is the overall structure diagram of the tunnel drainage system of the present invention；
Fig. 2 is the tunnel cross section schematic diagram of the tunnel drainage system of the present invention；
Fig. 3 is the structural schematic diagram of the gas compressed water generation apparatus of the tunnel drainage system of the present invention；
In figure：Drilling 1, siphon pipe 2, gutter 4, tunnel 5, massif 6, roadbed side slope 7, gas compressed water generation apparatus 3, water tank 31, exhaust
Pipe 32, valve A 33, drainpipe 34, valve B 35, gas cylinder A 81, gas cylinder B 82, diversion pipe 83, pressure gauge 84, gas-guide tube 85,
Valve C 86, branch pipe 87.
Specific implementation mode
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate this hair
It is bright rather than limit the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, art technology
Personnel can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Fixed range.
Embodiment 1
As shown in Figure 1 and Figure 2, the present embodiment provides a kind of tunnel drainage system, the system include drilling 1, siphon pipe 2, gutter 4,
Gas compressed water generation apparatus 3 needs the position drained setting drilling 1 in tunnel surrounding, and the water inlet of siphon pipe 2 is placed in drilling 1,
The water outlet of siphon pipe 2 is placed in closed water tank 31, and the elevation at 31 top of water tank is less than the elevation of 1 bottom of drilling, water tank 31
Be made of clear material, gas compressed water generation apparatus 3 is located on the roadbed side slope 7 outside tunnel, gas compressed water generation apparatus 3 include water tank 31,
Exhaust pipe 32, drainpipe 34, valve B35, gas cylinder A81, gas cylinder B82, diversion pipe 83, branch pipe 87, pressure gauge 84, is led valve A33
Tracheae 85, valve C86, water tank 31 are arranged on roadbed slope 7, and exhaust pipe 32 is mounted on the top of water tank 31, valve A33 installations
On exhaust pipe 32, the arrival end of drainpipe 34 is connected to the bottom of water tank 31, and valve B35 is mounted on the outlet of drainpipe 34
Place, gas cylinder A81 fill sodium carbonate liquor, and gas cylinder B82 fills acetum, passes through diversion pipe 83 between gas cylinder A81 and gas cylinder B82
Connection, the both ends of diversion pipe 83 are all located at liquid level hereinafter, being equipped with pressure gauge 84 among diversion pipe 83, and the arrival end of gas-guide tube 85 is set
Within gas cylinder A81, the arrival end of gas-guide tube 32 is more than liquid level, and the outlet end of gas-guide tube 32 is connect with water tank 31, valve C86
On gas-guide tube 85, branch pipe 87 is connected on diversion pipe 83, and the air inlet of branch pipe 87 is located at the liquid level of gas cylinder A81 or more.
A diameter of 4mm of the siphon pipe 2.The quantity that siphon pipe 2 is placed in water tank is 50.The exhaust pipe 32 it is a diameter of
10mm, a diameter of 10mm of the gas-guide tube 85.The volume of water tank 3 is set as 50 liters, and every 2 length of siphon pipe is 50m, and 50
Root siphon pipe 2 needs 32 liters of water full of water, and the sodium carbonate liquor of gas cylinder A81 is 500 grams of sodium carbonate and 2 liters of water, the lemon of gas cylinder B82
Lemon acid solution is 500 grams of citric acids and 1 kilogram of water, according to chemical reaction equation：2C6H8O7+3Na2CO3=2C6H5O7Na3+3CO2+
3H2After the reaction completely of O, sodium carbonate and citric acid, under room temperature, normal pressure, 35 liters of carbon dioxide can be generated.
A kind of tunnel drainage method, this method include：
（1）When tunnel drainage system normal use, valve A33 is opened, closes valve C86, opens valve B35；
（2）When half and more siphon pipe 2 stops flowing, valve B35 is closed, 31 water level of water tank is made to increase, in water tank 31
Gas is discharged by exhaust pipe 32；
（3）When water tank collection full water, valve A33 is closed, squeezes gas cylinder B82, so that acetum is passed through diversion pipe 83 and flows into gas cylinder
A81, acetic acid is reacted with sodium carbonate generates carbon dioxide gas, and gas enters gas cylinder B82 by branch pipe 87, keeps gas cylinder A81 gentle
Air pressure in bottle B82 reaches balance；
（4）When pressure gauge 84 is shown as 250kpa, valve C86 is opened, gas is filled with water tank 31, makes the inverse pressure of the water in water tank 31
Into siphon pipe 2, by siphon pipe 2 silt and air be discharged, after gas stream goes out gas cylinder A 81,81 pressure of gas cylinder A reduces,
Acetum is pressed into gas cylinder A 81 by diversion pipe 83, and continuing to react generates gas；
（5）When position of 31 water level decreasing of water tank to 2 water outlet of siphon pipe, valve C86 is closed, opens valve B35, opens valve
Door A33, supplements sodium carbonate into gas cylinder A81, acetic acid is supplemented into gas cylinder B82.
Claims (2)
1. a kind of tunnel drainage system, which is characterized in that the system includes drilling 1, siphon pipe 2, gutter 4, gas compressed water generation apparatus
3, the position drained setting drilling 1 is needed in tunnel surrounding, the water inlet of siphon pipe 2 is placed in drilling 1, and siphon pipe 2 goes out
The mouth of a river is placed in closed water tank 31, and the elevation at 31 top of water tank is less than the elevation of 1 bottom of drilling, and water tank 31 is by transparent material system
At gas compressed water generation apparatus 3 is located on the roadbed side slope 7 outside tunnel, and gas compressed water generation apparatus 3 includes water tank 31, exhaust pipe 32, valve
A33, drainpipe 34, valve B35, gas cylinder A81, gas cylinder B82, diversion pipe 83, branch pipe 87, pressure gauge 84, gas-guide tube 85, valve
C86, water tank 31 are arranged on roadbed slope 7, and exhaust pipe 32 is mounted on the top of water tank 31, and valve A33 is mounted on exhaust pipe 32
On, the arrival end of drainpipe 34 is connected to the bottom of water tank 31, and valve B35 is mounted on the exit of drainpipe 34, and gas cylinder A81 is contained
There are sodium carbonate liquor, gas cylinder B82 to fill acetum, connected by diversion pipe 83 between gas cylinder A81 and gas cylinder B82, diversion pipe
83 both ends are all located at liquid level hereinafter, being equipped with pressure gauge 84 among diversion pipe 83, the arrival end of gas-guide tube 85 be placed in gas cylinder A81 it
Interior, more than liquid level, the outlet end of gas-guide tube 32 is connect the arrival end of gas-guide tube 32 with water tank 31, and valve C86 is mounted on air guide
On pipe 85, branch pipe 87 is connected on diversion pipe 83, and the air inlet of branch pipe 87 is located at the liquid level of gas cylinder A81 or more, the siphon
A diameter of 4mm of pipe, the quantity of merging siphon pipe is 50-100 roots in the water tank, the exhaust pipe it is a diameter of
10mm, a diameter of 10mm of the gas-guide tube.
2. a kind of method of tunnel drainage using system described in claim 1, which is characterized in that this method includes：
（1）When tunnel drainage system normal use, valve A is opened, closes valve C；
（2）When half and more siphon pipe stops flowing, valve B is closed, so that cistern water level is increased, gas is by arranging in water tank
Tracheae is discharged；
（3）When water tank collection full water, valve A is closed, squeezes gas cylinder B, acetum is made to flow into gas cylinder A, acetic acid by diversion pipe
It is reacted with sodium carbonate and generates carbon dioxide gas, gas enters gas cylinder B by branch pipe, the air pressure in gas cylinder A and gas cylinder B is made to reach
Balance；
（4）When pressure gauge is shown as 250kpa, valve C is opened, gas is filled with water tank, makes the water in water tank is inverse to be pressed into siphon
Pipe, by siphon pipe silt and air be discharged；
（5）When cistern water level drops to the position of siphon pipe water outlet, valve C is closed, opens valve B, opens valve A, to
Sodium carbonate is supplemented in gas cylinder A, acetic acid is supplemented into gas cylinder B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810333403.6A CN108547662B (en) | 2018-04-13 | 2018-04-13 | A kind of tunnel drainage system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810333403.6A CN108547662B (en) | 2018-04-13 | 2018-04-13 | A kind of tunnel drainage system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108547662A true CN108547662A (en) | 2018-09-18 |
| CN108547662B CN108547662B (en) | 2019-11-08 |
Family
ID=63514747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810333403.6A Expired - Fee Related CN108547662B (en) | 2018-04-13 | 2018-04-13 | A kind of tunnel drainage system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108547662B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110671149A (en) * | 2019-11-23 | 2020-01-10 | 范雲鹤 | Drainage system of karst tunnel |
| CN110685746A (en) * | 2019-11-23 | 2020-01-14 | 范雲鹤 | Automatic tunnel drainage system |
| CN110847961A (en) * | 2019-11-23 | 2020-02-28 | 范雲鹤 | Tunnel drainage system |
| WO2021097937A1 (en) * | 2019-11-23 | 2021-05-27 | 嘉兴金喜莱科技有限公司 | Long tunnel water drainage system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4717284A (en) * | 1986-01-20 | 1988-01-05 | Hydrogeo S.A. | Device for draining soils in depth |
| US5035535A (en) * | 1989-06-02 | 1991-07-30 | Gress S.A. | Device for regulating the flow in a drainage siphon tube |
| EP0678632A1 (en) * | 1994-04-21 | 1995-10-25 | Groupe Ress | Controlling device for a drain-syphon |
| CN201068566Y (en) * | 2007-07-30 | 2008-06-04 | 刘华 | Siphon type flow-guiding water-fetching device |
| CN102251529A (en) * | 2011-06-02 | 2011-11-23 | 浙江大学 | Self-balancing siphon drainage method by using side slope declining drill hole |
| CN107237650A (en) * | 2017-06-30 | 2017-10-10 | 浙江大学 | A kind of drilling siphon drainage system and method for being used to handle the infiltration of Tunnel wall |
-
2018
- 2018-04-13 CN CN201810333403.6A patent/CN108547662B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4717284A (en) * | 1986-01-20 | 1988-01-05 | Hydrogeo S.A. | Device for draining soils in depth |
| US5035535A (en) * | 1989-06-02 | 1991-07-30 | Gress S.A. | Device for regulating the flow in a drainage siphon tube |
| EP0678632A1 (en) * | 1994-04-21 | 1995-10-25 | Groupe Ress | Controlling device for a drain-syphon |
| CN201068566Y (en) * | 2007-07-30 | 2008-06-04 | 刘华 | Siphon type flow-guiding water-fetching device |
| CN102251529A (en) * | 2011-06-02 | 2011-11-23 | 浙江大学 | Self-balancing siphon drainage method by using side slope declining drill hole |
| CN107237650A (en) * | 2017-06-30 | 2017-10-10 | 浙江大学 | A kind of drilling siphon drainage system and method for being used to handle the infiltration of Tunnel wall |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110671149A (en) * | 2019-11-23 | 2020-01-10 | 范雲鹤 | Drainage system of karst tunnel |
| CN110685746A (en) * | 2019-11-23 | 2020-01-14 | 范雲鹤 | Automatic tunnel drainage system |
| CN110847961A (en) * | 2019-11-23 | 2020-02-28 | 范雲鹤 | Tunnel drainage system |
| WO2021097937A1 (en) * | 2019-11-23 | 2021-05-27 | 嘉兴金喜莱科技有限公司 | Long tunnel water drainage system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108547662B (en) | 2019-11-08 |
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Effective date of registration: 20191016 Address after: 322104 No. 88, Ju Road, Hefeng village, six stone street, Dongyang, Jinhua, Zhejiang. Applicant after: Dongyang Juntai Construction Engineering Co.,Ltd. Address before: 610227 Shuangliu District, Sichuan University, Jiang'an campus, Sichuan University, Sichuan Applicant before: Fan Yunhe |
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Effective date of registration: 20221201 Address after: 256623 Room 427, West Annex Building, Gaochuang Center Office Building, the intersection of Gaoshi Road and Xinwu Road, Xiaoying Office, High tech Zone, Binzhou City, Shandong Province Patentee after: Binzhou High tech High end Equipment Manufacturing Industrial Park Co.,Ltd. Address before: 322104 No.88 Ju Road, Hefeng village, Liushi street, Dongyang City, Jinhua City, Zhejiang Province Patentee before: Dongyang Juntai Construction Engineering Co.,Ltd. |
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Granted publication date: 20191108 |